Matthew 12:4

“How he entered into the house of God, etc.] Not the temple, which was not then built; but the tabernacle, which was then at Nob, the city of the priests, and which probably adjoined to Abimelech’s house: and did eat the shewbread; for that this is meant by the hallowed bread, in (<092106>1 Samuel 21:6) is certain; though R. Joseph Kimchi f714 thinks it was the bread of the thank offering; to which R. Levi ben Getsom f715 seems to incline: but the general sense of the Jewish doctors f716 is, that it was the showbread; and which is very clear from that text, and is rightly affirmed by Christ; which was not lawful for him to eat, neither for them which were with him, but only for the priests:…”

“How he entered into the house of God, and did eat the showbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests?--No example could be more apposite than this. The man after God's own heart, of whom the Jews ever boasted, when suffering in God's cause and straitened for provisions, asked and obtained from the high priest what, according to the law, it was illegal for anyone save the priests to touch. Mark (Mar 2:26) says this occurred "in the days of Abiathar the high priest." But this means not during his high priesthood--for it was under that of his father Ahimelech--but simply, in his time. Ahimelech was soon succeeded by Abiathar, whose…”

“How he entered into the house of God - That is, the “tabernacle,” the temple not being then built. Have ye not read in the law? - In the law, or in the books of Moses. Profane the Sabbath - He referred them to the conduct of the priests also. On the Sabbath days they were engaged, as well as on other days, in killing beasts for sacrifice, Numbers 28:9-10. Two lambs were killed on the Sabbath, in addition to the daily sacrifice. The priests must be engaged in killing them, and making fires to burn them in sacrifice, whereas to kindle a fire was expressly forbidden the Jews on the Sabbath, Exodus 35:3. They did that which, for other persons to do, would have been “profaning” the Sabbath. Yet…”

“He entered into the house of God - Into the tabernacle. The temple was not yet built. The show bread - So they called the bread which the priest, who served that week, put every Sabbath day on the golden table that was in the holy place, before the Lord. The loaves were twelve in number, and represented the twelve tribes of Israel: when the new were brought, the stale were taken away, but were to be eaten by the priests only. Sa1 21:6. Matthew 12:5”

“the shew-bread, Exo 25:30; Lev 24:5-9 but: Exo 29:32, Exo 29:33; Lev 8:31, Lev 24:9 Matthew 12:5”