Numbers 15:32

And the sons of Israel shall be in the desert, and they shall find a man gathering wood in the day of the Sabbath.

Exodus 35:2-3

Six days thou shalt do work and in the seventh day a holy cessation, a cessation to Jehovah: all doing work in it shall die.

And he will say to them, This what Jehovah spake, To-morrow the Sabbath, a holy rest to Jehovah: what ye will cook, cook; and what ye will boil, boil; and all exceeding, leave for you for preservation till the morning.

Exodus 16:27-28

And it will be in the seventh day, and they will go forth from the people to gather, and they found not

Exodus 20:8-10

Remember the day of the Sabbath to consecrate it

Exodus 31:14-15

And watch ye the Sabbath, for it is holy to you. He profaning it, dying, shall die; for all doing work in it, and that soul shall be cut off from the midst of his people.