'Forty four' in the Bible

I heard, too, the number of those who had been sealed. It was one hundred and forty-four thousand; and they were from every tribe of the Israelites.

Then, in my vision, I saw the Lamb standing on Mount Zion. With him were a hundred and forty-four thousand men, with his name and the name of his Father written on their foreheads.

They are singing what seems to be a new song, before the throne, and before the four Creatures and the Councillors; and no one was able to learn that song except the hundred and forty-four thousand who had been redeemed from earth.