'Ninety nine' in the Bible

When Abram was ninety-nine years old, the Lord came to him, and said, I am God, Ruler of all; go in my ways and be upright in all things,

Abraham was ninety-nine years old when he underwent circumcision.

What would you say now? if a man has a hundred sheep, and one of them has gone wandering away, will he not let the ninety-nine be, and go to the mountains in search of the wandering one?

And if he comes across it, truly I say to you, he has more joy over it than over the ninety-nine which have not gone out of the way.

What man of you, having a hundred sheep, if one of them gets loose and goes away, will not let the ninety-nine be in the waste land by themselves, and go after the wandering one, till he sees where it is?

I say to you that even so there will be more joy in heaven when one sinner is turned away from his wrongdoing, than for ninety-nine good men, who have no need of a change of heart.