New Revised Standard Version
Then Saul said to David, “Blessed be you, my son David! You will do many things and will succeed in them.” So David went his way, and Saul returned to his place.

Contemporary English Version
"David, my son, I pray that the Lord will bless you and make you successful!" Saul went back home. David also left,

New American Bible
Then Saul said to David: “Blessed are you, my son David! You shall certainly succeed in whatever you undertake.” David went his way, and Saul returned to his place.

Douay-Rheims Bible
Then Saul said to David: Blessed art thou, my son David: and truly doing thou shalt do, and prevailing thou shalt prevail. And David went on his way, and Saul returned to his place.

Then Saul said to David: Blessed art thou, my son David: and truly doing thou shalt do, and prevailing thou shalt prevail. And David went on his way, and Saul returned to his place.

Blessed

1 Samuel 24:19 For who when he hath found his enemy, will let him go well away? But the Lord reward thee for this good turn, for what thou hast done to me this day.

Numbers 24:9,10 Lying down he hath slept as a lion, and as a lioness, whom none shall dare to rouse. He that blesseth thee, shall also himself be blessed: he that curseth thee shall be reckoned accursed. . . .

prevail

Genesis 32:28 But he said: Thy name shall not be called Jacob, but Israel; for if thou hast been strong against God, how much more shalt thou prevail against men?

Isaiah 54:17 No weapon that is formed against thee shall prosper: and every tongue that resisteth thee in judgment, thou shalt condemn. This is the inheritance of the servants of the Lord, and their justice with me, saith the Lord.

Hosea 12:4 And he prevailed over the angel, and was strengthened: he wept, and made supplication to him: he found him in Bethel, and there he spoke with us.

Romans 8:35,37 Who then shall separate us from the love of Christ? Shall tribulation? Or distress? Or famine? Or nakedness? Or danger? Or persecution? Or the sword? . . .

So David

1 Samuel 24:22 And David swore to Saul. So Saul went home: and David and his men went up into safer places.

Proverbs 26:25 When he shall speak low, trust him not: because there are seven mischiefs in his heart.