Al-Mu'jam al-Awsat 3464 — Salim bin Abdullah bin Umar

Imam al-A'mash (may Allah have mercy on him) narrates that Salim bin Abdullah bin Umar (may Allah have mercy on him) was sitting with al-Hajjaj when al-Hajjaj said to him: "Get up and strike off this man's neck." So Salim (may Allah have mercy on him) took the sword, took the man with him and headed towards the door of the palace. His father, Sayyiduna Abdullah bin Umar (may Allah be pleased with them both), saw him taking the man away and said (to al-Hajjaj): "Do you think he will actually do it?" and he repeated this two or three times. Then, when Salim (may Allah have mercy on him) had taken him outside, he asked him: "Have you prayed the Fajr prayer?" He said: "Yes." Salim (may Allah have mercy on him) said: "Then go whichever way you wish." Then he came back and threw down the sword. Al-Hajjaj said to him: "Did you strike off his neck?" He said: "No." He asked: "Why?" He said: "I heard this father of mine say that the Messenger of Allah (peace and blessings be upon him) said: 'Whoever prays the Fajr prayer is under the protection and care of Allah until evening.'"
Then his father said to him: "Well done, you have proved yourself very clever! We named you Salim only so that you would remain safe."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-A'mash except Ata bin Muslim; Musa bin Ayyub is alone in narrating it."