What does Psalm 35:2 mean?

Interestingly, both items mentioned here are defensive, and would never be used at the same time. Continuing the image of the Lord as a warrior on his behalf (Psalm 35:1), David asks the Lord to symbolically take up tools of warfare. A "buckler" is from the Hebrew māgēn, referring to a small, maneuverable shield easily carried in one hand. The other term is sinnā, meaning a large "standing shield" that covers the entire body. The two are used in distinct phases of war and for different reasons. David is issuing a general plea for God to act as His warrior champion: to be his defense and strength in battle.

Isaiah 63 describes the Lord as a warrior, "marching in the greatness of his strength" in the end times (Isaiah 63:1). He treads the winepress alone and tramples His enemies in His wrath (Isaiah 63:3). He declares that the day of His vengeance was in His heart (Isaiah 63:4). In verse 6 the Lord states, "I trampled down the peoples in my anger; I made them drunk in my wrath, and I poured out their lifeblood on the earth" (Isaiah 63:6).

Although God is loving, merciful, and kind, and the Savior of those who believe on His Son, He does not tolerate sin. All who reject His offer of salvation will experience His wrath. He will defend His righteousness and judge all who oppose Him (Acts 17:31; Romans 6:23; Hebrews 9:27; Jude 1:14–15; Revelation 19:11–16; 20:10–15).