וְעַתָּ֣ה ׀ תֶּחֱזַ֣קְנָה יְדֵיכֶ֗ם וִֽהְיוּ֙ לִבְנֵי־חַ֔יִל כִּי־מֵ֖ת אֲדֹנֵיכֶ֣ם שָׁא֑וּל וְגַם־אֹתִ֗י מָשְׁח֧וּ בֵית־יְהוּדָ֛ה לְמֶ֖לֶךְ עֲלֵיהֶֽם׃ (פ)
At ngayon, magpakatatag kayo at maging magigiting, sapagkat patay na ang inyong panginoong si Saul, at ako rin ay pinahiran ng sambahayan ng Juda bilang hari sa kanila.”
Malbim
Magnifies: And proportional to the greatness of gratitude, so shall the salvation increase in each and every moment... So that [God] shall magnify the salvations of God's king: and, external to how God will repay me for gratitude and praise, [God] will perform [acts of] lovingkindness for God's anointed one, for David and for his seed, for the faithful [acts of] lovingkindness of David [included] the cutting him of the covenant that sovereignty would not depart from his seed, and this is out of lovingkindness, as is written in II Samuel 2:7ff, and this lovingkindness shall continue for eternity.
Ralbag
If he shall show himself a worthy man, there shall not a hair of him fall to the earth: This means, "If he will put forth his strength to be a servant of the king and his commands like a worthy man, no harm will come to him for my part." And thus David sent to the men of Jabesh-Gilead, "Now therefore let your hands be strong, and be ye valiant." (2 Samuel 2:7)