When Israel went out of Egypt - literally, “In the going out of Israel from Egypt.” This is not to be confined to the exact act of the exodus, but embraces all that properly entered into that migration - the whole train of events which resuited in their being brought into the promised land.
The house of Jacob - The family of Jacob - a name appropriately used here, since it was the family of Jacob that had gone down into Egypt, and that had increased to these great numbers.
From a people of strange language - Speaking a foreign or a barbarian tongue. See the notes at Psalms 81:5.