This is from Luke 15:3-6

Then Jesus told them this parable: "Suppose one of you has a hundred sheep and loses one of them. Does he not leave the ninety-nine in the open country and go after the lost sheep until he finds it? And when he finds it, he joyfully puts it on his shoulders and goes home. Then he calls his friends and neighbors together and says, 'Rejoice with me; I have found my lost sheep.'

even ONE lost sheep, the Shepherd rejoices when he finds it.

Just ONE.

how much more should people rejoice for a lost friend?

Thank God for you. I'll really really cherish our friendship this time. xD