This is similar to Matthew, chapter 16:8. However, this reprimand is much sharper. Jesus became aware or knew of their discussions (καὶ γνοὺς). He asked them (λέγει αὐτοῖς) why were they worried, talking, or debating (Τί διαλογίζεσθε) about not having any bread (ὅτι ἄρτους οὐκ ἔχετε)? Jesus wanted to know if they still did not perceive (οὔπω νοεῖτε) or understand (οὐδὲ συνίετε) because of their hardened hearts (πεπωρωμένην ἔχετε τὴν καρδίαν ὑμῶν). These disciples were missing the point about Jesus, since he would provide nourishment for them. Instead of calling them men of little faith, as Matthew did, Mark implies that Jesus seemed to indicate that they were stupid with hard hearts.
There is something similar in Matthew, chapter 16:5. In Matthew, the disciples discovered this problem when they landed on the other side of the Sea of Galilee. However, Mark said that it took place while they were still in the boat. In an ironic twist of fate, the disciples of Jesus forget to bring any bread with them on this trip across the Sea of Galilee, with no indication of the place where they going. Mark said that the disciples forgot to bring loaves of bread (Καὶ ἐπελάθοντο λαβεῖν ἄρτους). They only had one loaf of bread (καὶ εἰ μὴ ἕνα ἄρτον οὐκ εἶχον) with them (μεθ’ ἑαυτῶν) in the boat (ἐν τῷ πλοίῳ). Bread was a key food element of nourishment. Remember the bread of life.
This is similar to Mark, chapter 8:17, where the reprimand is much sharper. Jesus became aware of their discussions (γνοὺς δὲ ὁ Ἰησοῦς). He reprimanded them by calling them men of little faith (ὀλιγόπιστοι). This word “ὀλιγόπιστοι” was a favorite of Matthew, since 5 of the 6 times it appears in the New Testament literature, Matthew used it. Why were they worried, talking, or debating among themselves (εἶπεν Τί διαλογίζεσθε ἐν ἑαυτοῖς) about not having any bread (ἄρτους οὐκ ἔχετε)? The disciples were missing the point about Jesus, since he would provide nourishment for them.
There is something similar in Mark, chapter 8:14. In an ironic twist of fate, the disciples of Jesus forget to bring bread with them on this trip across the Sea of Galilee. There is no indication of the place where they were. Mark said that they only had one loaf of bread. When the disciples got to the other side of the sea (Καὶ ἐλθόντες οἱ μαθηταὶ εἰς τὸ πέραν), they realized that they had forgotten to bring any bread with them (ἐπελάθοντο ἄρτους λαβεῖν). Bread was a key food element of nourishment. Remember the bread of life.
Equivalent passages to this can be found in Mark, chapter 6:8-9, and Luke, chapter 9:3. Jesus told them what they could not bring with them on their mission. They were not to bring with them any gold (Μὴ κτήσησθε χρυσὸν), silver (μηδὲ ἄργυρον), or copper (μηδὲ χαλκὸν) in their money belts (εἰς τὰς ζώνας ὑμῶν) since they did not need money. They were not to take any bag or sack for their journey (μὴ πήραν εἰς ὁδὸν). They were not to take two tunics (μηδὲ δύο χιτῶνας) since one would be enough. They were not to take any sandals (μηδὲ ὑποδήματα) or a staff (μηδὲ ῥάβδον). However, these laborers did deserve their food (ἄξιος γὰρ ὁ ἐργάτης τῆς τροφῆς αὐτοῦ). They did not need any money or material things, but they certainly needed something to eat or nourishment. This was a very strong demand on these missionaries of Jesus.
Once again, we have the shift from a third person description about Jerusalem to a first person singular Jerusalem itself praying directly to Yahweh, the God of Israel. All the people were groaning due to the lack of bread or nourishment. They were trading their treasures for food, which makes sense. They wanted to revive their strength. This verse ends with the first person singular plea to Yahweh. Jerusalem laments how worthless she has become. This verse starts with the Hebrew consonant letter Kaph. Each verse after this will use the next letter of the Hebrew alphabet in this acrostic poem.
Yahweh, via Jeremiah, issued a series of oracles about the power of his word. If a prophet had a dream, let him tell that dream. However, anyone who had the word of Yahweh should also speak the word faithfully. Straw is dried up and useless, but wheat or grain is full of nourishment. The word of Yahweh was like fire or a hammer that could break any rock into pieces.