1 Samuel 21:6

21:6 So the priest gave him holy bread, for there was no bread there other than the bread of the Presence. It had been removed from before the Lord in order to replace it with hot bread on the day it had been taken away.

Matthew 12:4

12:4 how he entered the house of God and they ate ¹  the sacred bread, ²  which was against the law ³  for him or his companions to eat, but only for the priests? ⁴ 

[12:4]  ¹ tc The Greek verb ἔφαγεν (efagen, “he ate”) is found in a majority of witnesses (Ì⁷⁰ C D L W Θ Ë^1,13 33 Ï latt sy co) in place of ἔφαγον (efagon, “they ate”), the wording found in א B pc. ἔφαγεν is most likely motivated by the parallels in Mark and Luke (both of which have the singular).

[12:4]  ² tn Grk “the bread of presentation.”

[12:4]  ³ sn Jesus’ response to the charge that what his disciples were doing was against the law is one of analogy: “If David did it for his troops in a time of need, then so can I with my disciples.” Jesus is clear that on the surface there was a violation here. What is not as clear is whether he is arguing a “greater need” makes this permissible or that this was within the intention of the law all along.

[12:4]  ⁴ sn See 1 Sam 21:1-6.