The Prophet (peace and blessings be upon him) said: "Shall I not tell you about the best of your deeds, which is the purest in the sight of your Lord, which raises you to the highest ranks, which is better for you than spending gold and silver, and better for you than that you meet your enemy and strike their necks and they strike your necks?" The Companions (may Allah be pleased with them) said: "Why not!" The Prophet (peace and blessings be upon him) said: "The remembrance of Allah, the Exalted." [اسناده حسن، ترمذي:3377، ابن ماجه:3790]