'Forty four' in the Bible

I heard the number of those who were sealed, one hundred forty-four thousand, sealed out of every tribe of the children of Israel:

I saw, and behold, the Lamb standing on Mount Zion, and with him a number, one hundred forty-four thousand, having his name, and the name of his Father, written on their foreheads.

They sing a new song before the throne, and before the four living creatures and the elders. No one could learn the song except the one hundred forty-four thousand, those who had been redeemed out of the earth.

Its wall is one hundred forty-four cubits, by the measure of a man, that is, of an angel.