Matthew 3:9

3:9 and don’t think you can say to yourselves, ‘We have Abraham as our father.’ For I tell you that God can raise up children for Abraham from these stones!

Matthew 18:12

18:12 What do you think? If someone ¹  owns a hundred ²  sheep and one of them goes astray, will he not leave the ninety-nine on the mountains and go look for the one that went astray? ³ 

[18:12]  ¹ tn Grk “a certain man.” The Greek word ἄνθρωπος (anqrwpo") is used here in a somewhat generic sense.

[18:12]  ² sn This individual with a hundred sheep is a shepherd of modest means, as flocks often had up to two hundred head of sheep.

[18:12]  ³ sn Look for the one that went astray. The parable pictures God’s pursuit of the sinner. On the image of Jesus as the Good Shepherd, see John 10:1-18.