"10 Take heed that ye despise not one of these little ones; for I say unto you, That in heaven their angels do always behold the face of my Father which is in heaven. 11 For the Son of man is come to save that which was lost. 12 How think ye? if a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray? 13 And if so be that he find it, verily I say unto you, he rejoiceth more of that [sheep], than of the ninety and nine which went not astray. 14 Even so it is not the will of your Father which is in heaven, that one of these little ones should perish" (Matt. 18.10-14).

Not sure how this passage could support Calvinism. Seems completely out of character from the god of Calvinism because God doesn't want any of them to perish so He seeks (prevenient grace) even to the very last one who has gone astray. That's not the kind of love we see in the god of Calvinism who takes glory in passing over billions giving them no possibility of salvation. Where is the love in that? "Rejoice with me because I have found my lost sheep" (Luke 15.6). "In the same way, there is more joy in heaven over one lost sinner who repents and returns to God than over ninety-nine others who are righteous and haven’t strayed away!" (v.7) God reaches out and the lost sheep must repent and return/believe to God. In that order, not return/believe then repent.