Musnad Ahmad 10:26

Bishr ibn Shu'ayb ibn Abi Hamzah narrated to us, my father narrated to me, from al-Zuhri, Abu Salamah ibn 'Abd al-Rahman narrated to me, that Abu al-Raddad al-Laythi informed him, from 'Abd al-Rahman ibn 'Awf, that he heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Allah, the Mighty and Majestic, said: 'I am the Most Merciful (al-Rahman), and I created the womb (al-rahim), and I derived for it a name from My name. So whoever maintains it, Allah maintains him, and whoever severs it, He severs him.'"