'Keep' in the Bible

and said, "This is the blood of the covenant that God has commanded you to keep."

For if we deliberately keep on sinning after receiving the knowledge of the truth, no further sacrifice for sins is left for us,

Obey your leaders and submit to them, for they keep watch over your souls and will give an account for their work. Let them do this with joy and not with complaints, for this would be no advantage for you.