It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "The one who reciprocates equally is not the one who maintains the ties of kinship; rather, the one who truly maintains the ties of kinship is the one who, when relations are severed with him, still maintains the ties of kinship."
Hadith Referenceالادب المفرد / كتاب صلة الرحم / 68
Hadith Gradingالألبانی:صحیح
Hadith Takhrij«صحيح : أخرجه البخاري، الأدب، باب ليس الواصل بالمكافئ : 5991 و أبوداؤد : 1697 و الترمذي : 1908»