Thirteen times in this Psalm a word is repeated. Can you guess what it is?
I’ll cut to the chase; the repeated word is “praise.”
What does it mean? And, how is it used in this Psalm?
My Funk and Warnell’s dictionary disappeared, so I can’t give you a full-blown definition for the word, but I can at least give you some common usages of the word.
“Praise” can be commonly used as a verb (an action word) or as a noun (like a name). It could also be considered an invitation or command to do something. In this Psalm I believe that these all would be quite accurate. In this Psalm “praise” is both an invitation and a command. That is, God’s people are invited to worship God and acknowledge all He does; and as a command it behooves us to publicly and privately acknowledge and give recognition of God and His work and will.
As we come to the close of the Easter season and what our God has done and what He offers all people in Jesus Christ, “praise” is appropriate. It is the right thing to do. God has, indeed, done all things well. God made all things by the power of His Word. After people sinned in thought, word, and deed He sent His beloved Son to live, die, and rise again for the forgiveness of sinners like us. God didn’t have to do this, but because His love for all people was so great, He did this anyway.
So, we turn to Psalm 150 as we continue through the Easter season.
 Praise the Lord! Praise God in his sanctuary; praise him in his mighty heavens!  Praise him for his mighty deeds; praise him according to his excellent greatness!  Praise him with trumpet sound; praise him with lute and harp!  Praise him with tambourine and dance; praise him with strings and pipe!  Praise him with sounding cymbals; praise him with loud clashing cymbals!  Let everything that has breath praise the Lord! Praise the Lord!