Musnad Ahmad 1156:19

Abu Mu’awiyah narrated to us, he said: Al-A’mash narrated to us, from Shaqiq, from Umm Salamah, she said: Abd al-Rahman ibn Awf entered upon her and said: "O Mother, I fear that the abundance of my wealth will destroy me; I am the wealthiest of the Quraysh." She said: "O my son, then spend, for I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'Indeed, among my companions are those who will not see me after I depart from them.'" So he went out and met Umar and informed him. Umar came and entered upon her and said to her: "By Allah, am I among them?" She said: "No, and I will not absolve anyone after you."