I heard the Messenger of Allah ﷺ say: Allah the Exalted has said: I am Compassionate, and this has been derived from mercy. I have derived its name from My name. If anyone joins it, I shall join him, and if anyone cuts it off, I shall cut him off. (Using translation from Abū Dāʾūd 1694)   

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ قَالَ اللَّهُ ﷻ أَنَا الرَّحْمَنُ وَهِيَ الرَّحِمُ شَقَقْتُ لَهَا اسْمًا مِنَ اسْمِي فَمَنْ وَصَلَهَا وَصَلْتُهُ وَمَنْ قَطَعَهَا قَطَعْتُهُ وَمَنْ بَتَّهَا أَبَتُّهُ صحيح  

[Machine] He (the narrator) heard the Messenger of Allah ﷺ say: "Allah the Exalted said: 'I am the Most Merciful. I have created the womb (i.e., the bond of kinship) and have derived its name from My Name. Whoever maintains ties of kinship, I maintain ties with him, and whoever severs ties of kinship, I sever ties with him.'" This is narrated by Abu Raddad Al-Laythi, with the addition of Sufyan bin 'Uyainah, Muhammad bin Abi 'Atiq, Shu'ayb bin Abi Hamzah, and Sufyan bin Husayn. It is an authentic narration.  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ قَالَ اللَّهُ تَبَارَكَ وَتَعَالَى أَنَا الرَّحْمَنُ خَلَقْتُ الرَّحِمَ وَشَقَقْتُ لَهَا مِنِ اسْمِي فَمَنْ وَصَلَهَا وَصَلْتُهُ وَمَنْ قَطَعَهَا بَتَتُّهُ «هَذَا أَبُو رَدَّادٍ اللَّيْثِيُّ قَدْ أَضَافَ فِيهِ سُفْيَانَ بْنَ عُيَيْنَةَ وَمُحَمَّدَ بْنَ أَبِي عَتِيقٍ وَشُعَيْبَ بْنَ أَبِي حَمْزَةَ وَسُفْيَانَ بْنَ حُسَيْنٍ» صحيح