Another explanation is that "On the day that God saved him" refers to what is written in Psalm 71:15, "My mouth shall tell of Your righteousness." You can infer from this that David did not allow any limb of his body to insult the Almighty. He praised Him with his head, as it says, "My head will be saturated with oil" (Psalm 23:5). He gazed at Him with his eyes, as it says, "My eyes are ever towards the Lord" (Psalm 25:15).
He spoke of His righteousness with his mouth, as it says, "My mouth shall tell of Your righteousness" (Psalm 71:15). He meditated on His words with his tongue, as it says, "And my tongue shall meditate on Your righteousness" (Psalm 35:28). He was exhausted from calling out to Him with his throat, as it says, "My throat is parched" (Psalm 69:4). His lips rejoiced in speaking of Him, as it says, "My lips shall sing Your praise" (Psalm 71:23).
His heart and flesh exalted in Him, as it says, "My heart and my flesh sing for joy to the living God" (Psalm 84:3). In short, he praised God with all his bones, as it says, "All my bones shall say, 'Lord, who is like You?'" (Psalm 35:10). His soul blessed God, as it says, "Bless the Lord, O my soul" (Psalm 104:1). And his spirit praised Him, as it says, "Let every soul praise the Lord" (Psalm 150:6).
David said, "Even though I praised Him in all these ways, I still cannot adequately praise Him. 'My mouth shall tell of Your righteousness.'"...