Verses with the word psalm in the Old Testament (3 verses):

1 Chronicles 16:7
Then on that day David delivered first this psalm to thank the LORD into the hand of Asaph and his brethren.

Psalms 81:2
Take a psalm, and bring hither the timbrel, the pleasant harp with the psaltery.

Psalms 98:5
Sing unto the LORD with the harp; with the harp, and the voice of a psalm.