B'reishit 21:3 - And Avraham called his son who was born to him, whom was born from Sara, Yitzchak.

According to one Tradition, Yitzchak was born on the first day of Pesach.

Bamidbar 28:18 talks about the first day of Pesach - On the first day it is called Holy, all M'lechet Avoda you shall not do.

Both mentioned p'sukim have the same G'matriya - 2794.

The promise by G-d to Avraham that his descendants will be as countless as the grains of sand and as the stars was "begun" with the birth of Yitzchak. It took a major leap forward with the description at the end of Vayigash, B'reishit 47:27 - And Israel dwelt in the land of Egypt in the land of Goshen... and they grew andmultiplied greatly.

This pasuk also has that same G'matriya.