Numbers 9:3

So far as concerned the lamb and the unleavened bread, &c., for there were some things peculiar to the first passover in Egypt, as that they were to eat it in haste, with their loins girded, their shoes on their feet, and their staff in their hand, which were not properly rites or ceremonies of the passover, but circumstances of their present condition being the travellers and ready to depart, &c. Quest. Whence had they meal to make unleavened bread Answ. They were not now in haste, and so had time enough to procure it out of the land of Midian by the help of Moses's father-in-law, who lived there, which land was not far from Horeb or Sinai, as appears from Exodus 3:1.