Albert Barnes Commentary Psalms 35:2

"Take hold of shield and buckler, And stand up for my help." — Psalms 35:2 (ASV)

Take hold of shield and buckler - That is, arm yourself as if for the contest. It is a prayer, in a new form, that God would interpose, and that he would go forth as a warrior against the enemies of the psalmist. On the word “shield,” see the notes at (Psalms 5:12). Compare the notes at (Ephesians 6:16). On the word “buckler,” see the notes at (Psalms 18:2). These terms are derived from the armor of a warrior, and the prayer here is that God would appear in that character for his defense.

And stand up for my help - As a warrior stands up, or stands firm, to arrest the attack of an enemy.