´'Abdullah bin Amr narrated that:` the Prophet said: "Merely maintaining the ties of kinship is not adequate. But connecting the ties of kinship is when his ties to the womb are severed and he connects it."
Hadith ReferenceSunan at-Tirmidhi / Chapters on Righteousness And Maintaining Good Relations With Relatives / Hadith: 1908
Hadith Gradingالألبانی:صحيح غاية المرام (404) ، صحيح أبي داود (1489)