Proverbs 27:17-19

Amplified Bible

¹⁷ 
As iron sharpens iron,
So one man sharpens [and influences] another [through discussion].
¹⁸ 
He who tends the fig tree will eat its fruit,
And he who faithfully protects and cares for his master will be honored.^(A)
19 
As in water face reflects face,
So the heart of man reflects man.