David expresses a deep hope for divine care and rescue, basing his request directly on his moral behavior toward Saul. He viewed Saul's life as deeply precious and highly important [מצודת דוד, ביאור שטיינזלץ]. This respect was a practical reality, clearly shown when David deliberately held back from causing Saul any harm [ביאור שטיינזלץ].
Because of this restraint, David prays that God will treat his own life with that exact same value. Just as he showed mercy and spared Saul, he asks that his life be considered precious in the eyes of God. This plea rests on a firm belief in divine justice. David trusts that God faithfully rewards human actions measure for measure, and he hopes that through this merit, He will save him from all trouble [מלבי״ם].