Matthew 3:7-11

7 But when he saw many of the Pharisees and Sadducees coming for his baptism, he said to them, "You offspring of vipers, who warned you to flee from the wrath to come?
8 Therefore bring forth fruit worthy of repentance!
9 Don't think to yourselves, 'We have Abraham for our father,' for I tell you that God is able to raise up children to Abraham from these stones.
10 Even now the ax lies at the root of the trees. Therefore, every tree that doesn't bring forth good fruit is cut down, and cast into the fire.
11 I indeed baptize you in water for repentance, but he who comes after me is mightier than I, whose shoes I am not worthy to carry. He shall baptize you in the Holy Spirit.

Matthew 3:7-11 In-Context

5 Then people from Jerusalem, all of Judea, and all the region around the Jordan went out to him.
6 They were baptized by him in the Jordan, confessing their sins.
7 But when he saw many of the Pharisees and Sadducees coming for his baptism, he said to them, "You offspring of vipers, who warned you to flee from the wrath to come?
8 Therefore bring forth fruit worthy of repentance!
9 Don't think to yourselves, 'We have Abraham for our father,' for I tell you that God is able to raise up children to Abraham from these stones.
10 Even now the ax lies at the root of the trees. Therefore, every tree that doesn't bring forth good fruit is cut down, and cast into the fire.
11 I indeed baptize you in water for repentance, but he who comes after me is mightier than I, whose shoes I am not worthy to carry. He shall baptize you in the Holy Spirit.
12 His winnowing fork is in his hand, and he will thoroughly cleanse his threshing floor. He will gather his wheat into the barn, but the chaff he will burn up with unquenchable fire."
13 Then Jesus came from Galilee to the Jordan to John, to be baptized by him.