Exodus 16:23 then he said to them, "This is what the LORD meant: Tomorrow is a sabbath observance, a holy sabbath to the LORD. Bake what you will bake and boil what you will boil, and all that is left over put aside to be kept until morning."

Exodus 20:8 "Remember the sabbath day, to keep it holy.

Exodus 31:13 "But as for you, speak to the sons of Israel, saying, 'You shall surely observe My sabbaths; for this is a sign between Me and you throughout your generations, that you may know that I am the LORD who sanctifies you.

Mark 2:27 Jesus said to them, "The Sabbath was made for man, and not man for the Sabbath. (NASB ©1995)