“It was the seventh day, and all things were accomplished.”
And again:
“And on the seventh morn we leave the stream of Acheron.”
Callimachus the poet also writes:
“It was the seventh morn, and they had all things done.”
And again:
“Among good days is the seventh day, and the seventh race.”
And:
“The seventh is among the prime, and the seventh is perfect.”
And: