'Seventh Day' in the Bible

‘If a man dies very suddenly beside him, and he defiles his dedicated head, then he shall shave his head on the day that he becomes [ceremonially] clean; he shall shave it on the seventh day [the end of the purification period].

On the seventh day [it was] Elishama the son of Ammihud, leader [of the tribe] of the sons of Ephraim [who presented his offering];

That one shall purify himself from uncleanness with the water [made with the ashes of the burned heifer] on the third day and on the seventh day, and then he will be clean; but if he does not purify himself on the third day and on the seventh day, he will not be clean.

Then the clean person shall sprinkle [the water for purification] on the unclean person on the third day and on the seventh day, and on the seventh day the unclean man shall purify himself, and wash his clothes and bathe himself in water, and shall be [ceremonially] clean at evening.

On the seventh day you shall have a holy [summoned] assembly; you shall do no laborious work.

‘Then on the seventh day [of the Feast of Booths]: seven bulls, two rams, and fourteen male lambs one year old without blemish,

Camp outside the camp for seven days; whoever has killed any person and whoever has touched any dead body, purify yourselves and your captives, on the third day and on the seventh day.

And you shall wash your clothes on the seventh day and be clean, and afterward you may come into the camp.”