Psalm 18:49-50

Therefore I will praise you, LORD, among the nations; I will sing the praises of your name. He gives his king great victories; he shows unfailing love to his anointed, to David and to his descendants forever.

Therefore I will praise you, LORD, among the nations 
Psalm 9:11  Sing the praises of the LORD, enthroned in Zion; proclaim among the nations what he has done.

I will sing 
Psalm 7:17  I will give thanks to the LORD because of his righteousness; I will sing the praises of the name of the LORD Most High.
Psalm 9:2  I will be glad and rejoice in you; I will sing the praises of your name, O Most High.
Psalm 101:1  I will sing of your love and justice; to you, LORD, I will sing praise.
Psalm 108:1  My heart, O God, is steadfast; I will sing and make music with all my soul.
Psalm 146:2  I will praise the LORD all my life; I will sing praise to my God as long as I live.

the praises of your name 
Romans 15:8-9  For I tell you that Christ has become a servant of the Jews on behalf of God's truth, so that the promises made to the patriarchs might be confirmed and, moreover, that the Gentiles might glorify God for his mercy. As it is written: "Therefore I will praise you among the Gentiles; I will sing the praises of your name." (2 Samuel 22:50)

he shows unfailing love to his anointed 
2 Samuel 23:1  These are the last words of David: "The inspired utterance of David son of Jesse, the utterance of the man exalted by the Most High, the man anointed by the God of Jacob, the hero of Israel's songs: ..."

to David 
Psalm 144:9-10  I will sing a new song to you, my God; on the ten-stringed lyre I will make music to you, to the One who gives victories to kings, who delivers his servant David.

and to his descendants forever 
Psalm 89:4  " 'I will establish your line forever and make your throne firm through all generations.' " (2 Samuel 7:16)

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
Limited to 15 verses per post.