Then the Pharisees and Sadducees came, and testing Him asked that He would show them a sign from heaven. He answered and said to them, "When it is evening you say, 'It will be fair weather, for the sky is red'; and in the morning, 'It will be foul weather today, for the sky is red and threatening.' Hypocrites! You know how to discern the face of the sky, but you cannot discern the signs of the times. A wicked and adulterous generation seeks after a sign, and no sign shall be given to it except the sign of the prophet Jonah." And He left them and departed.Now when His disciples had come to the other side, they had forgotten to take bread. Then Jesus said to them, "Take heed and beware of the leaven of the Pharisees and the Sadducees." And they reasoned among themselves, saying, "It is because we have taken no bread." But Jesus, being aware of it, said to them, "O you of little faith, why do you reason among yourselves because you have brought no bread? Do you not yet understand, or remember the five loaves of the five thousand and how many baskets you took up? Nor the seven loaves of the four thousand and how many large baskets you took up? How is it that you do not understand that I did not speak to you concerning bread? -- but to beware of the leaven of the Pharisees and Sadducees." Then they understood that He did not tell them to beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.- Matthew 16:1-12
In yesterday's reading, we read that after healing the daughter of the Canaanite woman, Jesus departed from there, skirted the
Sea of Galilee, and went up on the mountain and sat down there. Then
great multitudes came to Him, having with them the lame, blind, mute,
maimed, and many others; and they laid them down at Jesus' feet, and He
healed them. So the multitude marveled when they saw the mute speaking,
the maimed made whole, the lame walking, and the blind seeing; and they
glorified the God of Israel. Now
Jesus called His disciples to Himself and said, "I have compassion on
the multitude, because they have now continued with Me three days and
have nothing to eat. And I do not want to send them away hungry, lest
they faint on the way." Then His disciples aid to Him, "Where could we get enough bread in the wilderness to fill such a great multitude?"
Jesus said to them, "How many loaves do you have?" And they said,
"Seven, and a few little fish." So He commanded the multitude to sit
down on the ground. And He took the seven loaves and the fish and gave
thanks, broke them and gave them to His disciples; and the disciples
gave to the multitude. So they all ate and were filled, and they took
up seven large baskets full of the fragments that were left. Now those
who ate were four thousand men, besides women and children. And He sent
away the multitude, got into the boat, and came to the region of
Magdala.
Then the Pharisees and Sadducees came, and testing Him asked that He
would show them a sign from heaven. He answered and said to them, "When
it is evening you say, 'It will be fair weather, for the sky is red';
and in the morning, 'It will be foul weather today, for the sky is red
and threatening.' Hypocrites! You know how to discern the face of the
sky, but you cannot discern the signs of the times." My study Bible explains that a sign from heaven means a spectacular display of power. It tells us that the time of the Messiah among the Jews was expected to be accompanied by signs, but these men are hypocrites who have not recognized the signs already being performed by Jesus because their hearts were hardened. Thus they ignore the works happening all around them.
"A wicked and adulterous generation seeks after a sign, and no sign shall
be given to it except the sign of the prophet Jonah." And He left them
and departed. Adulterous generation is an echo of the prophets, who used this term to indicate the faithlessness of the people in response to God (Jeremiah 2; Hosea 2:2-13). Jesus refuses to prove Himself in a spectacular way, my study Bible tells us, for a sign is never given to those whose motive is to test God. See also Matthew 4:5-7. The sign of the prophet Jonah is a veiled prediction of Christ's death and Resurrection (Matthew 12:40), which will be the ultimate sign that He is the Christ.
Now when His disciples had come to the other side, they had forgotten
to take bread. Then Jesus said to them, "Take heed and beware of the
leaven of the Pharisees and the Sadducees." And they reasoned among
themselves, saying, "It is because we have taken no bread." But Jesus,
being aware of it, said to them, "O you of little faith, why do you
reason among yourselves because you have brought no bread? Do you not
yet understand, or remember the five loaves of the five thousand and how
many baskets you took up? Nor the seven loaves of the four thousand
and how many large baskets you took up? How is it that you do not
understand that I did not speak to you concerning bread? -- but to
beware of the leaven of the Pharisees and Sadducees." Then they
understood that He did not tell them to beware of the leaven of
bread, but of the doctrine of the Pharisees and Sadducees. My study Bible explains that the leaven of the Pharisees is their doctrine and their hypocrisy (Luke 12:1). It notes that the reason the disciples are painfully slow to understand is that they have such little faith; they would not fully realize Christ's teachings until Pentecost, when the Holy Spirit was given. Jesus here refers to the two separate feedings in the wilderness; found at this reading, and in yesterday's reading (see above).