'Ninety nine' in the Bible

When Abram was ninety-nine years old, Yahweh appeared to Abram, and said to him, "I am God Almighty. Walk before me, and be blameless.

Abraham was ninety-nine years old, when he was circumcised in the flesh of his foreskin.

"What do you think? If a man has one hundred sheep, and one of them goes astray, doesn't he leave the ninety-nine, go to the mountains, and seek that which has gone astray?

If he finds it, most certainly I tell you, he rejoices over it more than over the ninety-nine which have not gone astray.

"Which of you men, if you had one hundred sheep, and lost one of them, wouldn't leave the ninety-nine in the wilderness, and go after the one that was lost, until he found it?

I tell you that even so there will be more joy in heaven over one sinner who repents, than over ninety-nine righteous people who need no repentance.