Sayyiduna Ibn Mas'ud (may Allah be pleased with him) was sitting in a circle after the Fajr prayer, and he said: "I adjure by Allah that whoever severs the ties of kinship should get up and leave us, for we wish to supplicate to our Lord, and the gates of heaven are closed to the one who severs the ties of kinship."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8761