'Ninety nine' in the Bible

When Abram [was] ninety-nine years old Yahweh appeared to Abram. And he said to him, "I [am] El-Shaddai; walk before me and be blameless

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

What do you think? If {a certain man has} a hundred sheep, and one of them wanders away, will he not leave the ninety-nine on the hills and go [and] look for the one that wandered away?

And if he happens to find it, truly I say to you that he rejoices over it more than over the ninety-nine that did not wander away.

"What man of you, having a hundred sheep and losing one of them, does not leave the ninety-nine in the grassland and go after the one that was lost until he finds it?

I tell you that in the [same] way, there will be more joy in heaven over one sinner who repents than over ninety-nine righteous people who have no need of repentance.