Sayyiduna Ibn Abbas (may Allah be pleased with them both) said concerning this saying of Allah Almighty: "Say: I do not ask you for any reward for it except love for kinship" [Surah al-Shura: 23]: The Messenger of Allah (peace and blessings be upon him) had kinship ties with all the clans of Quraysh. So when they denied him and refused to follow him, he (peace and blessings be upon him) said: "O my people, what do you think: if you refuse to follow me, then at least preserve my kinship with you, and let it not be that others of the Arabs are more deserving than you of protecting me and supporting me."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12970