The Apostle Paul
Ephesians 6:8ESV·traditional attribution

knowing that whatever good anyone does, this he will receive back from the Lord, whether he is a bondservant or is free.

John Calvin Reformed @genevareformer

8. Knowing that whatsoever good thing any man doeth. What a powerful consolation! However unworthy, however ungrateful or cruel, their masters may be, God will accept their services as rendered to himself. When servants take into account the pride and arrogance of their masters, they often become more indolent from the thought that their labor is thrown away.

Matthew Henry Presbyterian @wholebiblehenry

Here we have further directions concerning relative duties, in which the apostle is very particular. I. The duty of children to their parents. Come, you children, hearken to me, I will teach you the fear of the Lord. The great duty of children is to obey their parents (Eph 6:1), parents being the instruments of their being, God and nature having given them an authority...

Commenting on Ephesians 6:1-9

John Gill Reformed Baptist @doctorgill

Knowing that whatsoever good thing any man doth,.... According to the will of God, from right principles in his heart, and with a view to God's glory: the same shall he receive of the Lord; that is, he shall receive the fruit and advantage of it, in a way of grace, whether he be bond or free; a bondman or a free man, a master or a servant.