Mark 14:27-31

²⁷ Then Jesus said to them, “All of you will be made to stumble because of Me this night, for it is written: ‘I will strike the Shepherd, and the sheep will be scattered.’

²⁸ “But after I have been raised, I will go before you to Galilee.”

²⁹ Peter said to Him, “Even if all are made to stumble, yet I will not be.”

³⁰ Jesus said to him, “Assuredly, I say to you that today, even this night, before the rooster crows twice, you will deny Me three times.”

³¹ But he spoke more vehemently, “If I have to die with You, I will not deny You!” And they all said likewise.

Also found in Matthew 26:31-35.

The quote in verses 27 is from Zechariah 13:7.

Our Lord predicts that all the disciples without exception will be offended because of Him, and He confirms His prophecy by an Old Testament prediction. The word “offended” [stumble] is skandalizo “to find occasion of stumbling” in another, “to see in another what I disapprove of and what hinders me from acknowledging his authority.” The disciples deserted the Lord and fled. This was their act of stumbling. The occasion for their stumbling was in the fact that our Lord’s arrest and treatment by Rome might involved them in the same kind of treatment. They were out to save their own skins. This announcement of the desertion by the disciples was not made as a reproach, but as a preface of better things, namely, an early reunion. The adversative particle alla (but) is used, contrasting the gloom of the immediate future with the hope of the resurrection. — Wuest, pages 262-263.

Right after Jesus told the apostles that they would stumble, deny Him, and be scattered, He said that, after He rose, He would meet with them in Galilee. In other words, “You will fail Me, but I will not fail you.”

crows twice (v.30) — The third of the four “watches” of the night (12:00 am to 3:00 am) was called “cockcrowing” (cf. Mark 13:35). The cock would crow early in this period and again toward the period’s end. In Mark’s account Jesus referred to the second crowing so as to be quite specific. Matthew records a reiteration of His prediction in more general terms, that is, he refers to only one crowing, the second, which was the more commonly known of the two. — Thomas,page 220.

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Peter’s boast is turned into a prophecy of a greater downfall. … To this overconfident “certainly not I” of the disciple, the Master returns a very pointed and peremptory reply: I thee thee that thou (emphatic), today [time], on this night (more precise indication of time), shall deny Me, not once, but again, and again, and again. — Wuest, page 263.

spoke (v.31) — tense is “he kept on speaking”

more vehemently (v.31) = abundantly in matter and manner, with vehemence and iteration

Peter gets the attention, but all the other disciples, all of whom also scattered, felt the same way.