“Yisro, the minister of Midian, the father-in-law of Moshe, heard all that G-d did to Moshe and to Yisrael, His people – that Hashem took Yisrael out of Egypt.”

And Hashem said to Avram, “Go for yourself from your land, from your birth place, and from your father’s house to the land that I will show you.”

B’reishis 12:1

“You shall count for yourselves – from the morrow of the rest day (Pesach), from the day when you bring the omer (a measure of volume) of the waving – seven weeks, they shall be complete. Until the morrow of the seventh week you shall count, fifty days…” (Leviticus 23:15-16)