Cross reference
Leviticus 25:8
8 And thou shalt number seven sabbaths of years unto thee, seven times seven years; and there shall be unto thee the days of seven sabbaths of years, even forty and nine years.
Leviticus 23:15
15 And ye shall count unto you from the morrow after the sabbath, from the day that ye brought the sheaf of the wave-offering; seven sabbaths shall there be complete:
Genesis 2:2
2 And on the seventh day God finished his work which he had made; and he rested on the seventh day from all his work which he had made.