'Forty four' in the Bible

And I heard the number of the sealed ones: a hundred and forty-four thousand were sealed out of every tribe of the sons of Israel?

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

and they are singing a new song before the throne, and in presence of the four living creatures, and the elders. And no one was able to learn the song except the hundred and forty-four thousand, who have been redeemed from the earth.

And he measured the wall of it, a hundred and forty-four cubits, the measure of the man, that is of the angel.