Musnad Abu Ya'la al-Mawsili 7:6

Zuhayr narrated to us, Sufyan ibn 'Uyaynah narrated to us, from al-Zuhri, from Abu Salamah, that Abu al-Raddad fell ill, so 'Abd al-Rahman ibn 'Awf visited him. He said, "The best of them and the most connecting of them is Abu Muhammad." 'Abd al-Rahman said, "I heard the Messenger of Allah (ﷺ) say: Allah said: 'I am Allah, and I am the Rahman (the Most Merciful). It is the womb (al-rahim), and I have created the womb and derived its name from My name. So whoever connects it, I will connect him, and whoever severs it, I will sever him or cut him off.'"