Al-Attaf ibn Khalid was a contemporary and colleague of Imam Malik (may Allah be pleased with them both), described by al-Dhahabi as a trustworthy shaykh. He related a story that happened to his maternal aunt, who would be the daughter of al-Salt ibn Makhrama ibn Nawfal, one of the Companions of the Messenger of Allah (may Allah bless him and grant him peace):
On the authority of al-Attaf ibn Khalid who said: My maternal aunt said to me:
“I rode one day to the graves of the martyrs (i.e. of the Battle of Uhud)” – and she would always visit them – “and I got off at the grave of Hamza. I supplicated there as long as Allah willed for me to supplicate, and there was no one else in the valley beside a servant who was standing, holding the head of my riding beast. When I finished supplicating, I motioned like this with my hand and said, ‘Assalamu alaykum.'” She said: “So I heard a reply to my greeting coming from beneath. I was aware of it just as I am aware that Allah – most great and majestic – created me, and as I am aware of the night and day. Every hair on my body stood because of it.”
– Narrated by Ibn Abi al-Dunya, and copied from him by Ibn Kathir (may Allah have mercy on him).
[Shaykh Salih al-Ja’fari: Fath wa Fayd, p. 230]