Exodus 20:8-11

8 “Remember the Sabbath day, to keep it holy. 9 Six days you shall labor, and do all your work, 10 but the seventh day is a Sabbath to the Lord your God. On it you shall not do any work, you, or your son, or your daughter, your male servant, or your female servant, or your livestock, or the sojourner who is within your gates. 11 For in six days the Lord made heaven and earth, the sea, and all that is in them, and rested on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy.

Mark 2:23-27

23 One Sabbath he was going through the grainfields, and as they made their way, his disciples began to pluck heads of grain. 24 And the Pharisees were saying to him, “Look, why are they doing what is not lawful on the Sabbath?” 25 And he said to them, “Have you never read what David did, when he was in need and was hungry, he and those who were with him: 26 how he entered the house of God, in the time of Abiathar the high priest, and ate the bread of the Presence, which it is not lawful for any but the priests to eat, and also gave it to those who were with him?” 27 And he said to them, “The Sabbath was made for man, not man for the Sabbath.