New Revised Standard Version
But if you return to the city and say to Absalom, ‘I will be your servant, O king; as I have been your father’s servant in time past, so now I will be your servant,’ then you will defeat for me the counsel of Ahithophel.

Contemporary English Version
Go back into the city and tell Absalom, "Your Majesty, I am your servant. I will serve you now, just as I served your father in the past." Hushai, if you do that, you can help me ruin Ahithophel's plans.

New American Bible
but if you return to the city and say to Absalom, ‘Let me be your servant, O king; I was formerly your father’s servant, but now I will be yours,’ you will thwart for me the counsel of Ahithophel.

Douay-Rheims Bible
But if thou return into the city, and wilt say to Absalom: I am thy servant, O king: as I have been thy father's servant, so I will be thy servant: thou shalt defeat the counsel of Achitophel.

But if thou return into the city, and wilt say to Absalom: I am thy servant, O king: as I have been thy father's servant, so I will be thy servant: thou shalt defeat the counsel of Achitophel.

return

2 Samuel 15:20 Yesterday thou camest, and to day shalt thou be forced to go forth with us? but I shall go whither I am going: return thou, and take back thy brethren with thee, and the Lord will shew thee mercy, and truth, because thou hast shewn grace and fidelity.

Joshua 8:2 And thou shalt do to the city of Hai, and to the king thereof, as thou hast done to Jericho, and to the king thereof: but the spoils, and all the cattle, you shall take for a prey to yourselves: lay an ambush for the city behind it.

Matthew 10:16 Behold I send you as sheep in the midst of wolves. Be ye therefore wise as serpents and simple as doves.

as I have been

2 Samuel 16:16-19 And when Chusai the Arachite, David's friend, was come to Absalom, he said to him: God save thee, O king, God save thee, O king. . . .

then mayest

2 Samuel 17:5-14 But Absalom said: Call Chusai the Arachite, and let us hear what he also saith. . . .