Exodus 23:13-15

Young's Literal Translation

¹³ and in all that which I have said unto you ye do take heed; and the name of other gods ye do not mention; it is not heard on thy mouth.

¹⁴ `Three times thou dost keep a feast to Me in a year;

¹⁵ the Feast of Unleavened things thou dost keep; seven days thou dost eat unleavened things, as I have commanded thee, at the time appointed [in] the month of Abib; for in it thou hast come forth out of Egypt, and ye do not appear [in] My presence empty;