(Exodus, Ibid. 3) "The L–rd is a man of war; the L–rd is His name." R. Yehudah says: This is a verse rich from (what is written) in many places. We are hereby apprised that He revealed Himself to them in the implements of war. He revealed Himself to them as a warrior girded with a sword, viz. (Psalms 45:4) "Gird Your sword upon Your thigh, O Hero.
If God Is Infinite and Without Physical Form
Mekhilta Tractate Shirah 4:1