Plucking heads of grain (12:1): According to the Pharisees, plucking wheat from its stem is reaping, rubbing the wheat heads between one’s palms is threshing, and blowing away the chaff is winnowing![bsg_ref id="85" vol="" page="45"]
Showbread/consecrated bread (12:4): lit. ‘bread of the face’, i.e. bread set before the face or presence of God (Ex. 25:30; 35:13; 39:36, etc.)... The showbread consisted of twelve baked cakes, made of fine flour, each containing two-tenths of an ephah...These were set in two rows, six to a row (ma'ªreḵeṯ, Lv. xxiv. 6).[bsg_ref id="80" vol="" page="1183"]
Priests profane the sabbath (12:5): By definition, priestly duties are considered “work.” In this sense, the priests profaned the Sabbath by doing work associated with the sacrifices on this day (cf. Numbers 28:9).

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1 Peter – 4