Berean Study Bible
David replied, “Then you will come to know what your servant can do.” “Very well,” said Achish. “I will make you my bodyguard for life.”

King James Bible
And David said to Achish, Surely thou shalt know what thy servant can do. And Achish said to David, Therefore will I make thee keeper of mine head for ever.

American Standard Version
And David said to Achish, Therefore thou shalt know what thy servant will do. And Achish said to David, Therefore will I make thee keeper of my head for ever.

Darby Bible Translation
And David said to Achish, Thereby thou shalt know what thy servant can do. And Achish said to David, Therefore will I make thee keeper of my person for ever.

Douay-Rheims Bible
And David said to Achis: Now thou shalt know what thy servant will do. And Achis said to David: And I will appoint thee to guard my life for ever.

English Revised Version
And David said to Achish, Therefore thou shalt know what thy servant will do. And Achish said to David, Therefore will I make thee keeper of mine head for ever.

Young's Literal Translation
And David saith unto Achish, 'Therefore -- thou dost know that which thy servant dost do.' And Achish saith unto David, 'Therefore -- keeper of my head I do appoint thee all the days.'