Narrated Tawus:

Ibn `Abbas recited the Qur'anic Verse:--'Except to be kind to me for my kin-ship to you--" (42.23) Sa`id bin Jubair said, "(The Verse implies) the kinship of Muhammad." Ibn `Abbas said, "There was not a single house (i.e. sub-tribe) of Quraish but had a kinship to the Prophet (ﷺ) and so the above Verse was revealed in this connection, and its interpretation is: 'O Quraish! You should keep good relation between me (i.e. Muhammad) and you."

Narrated Ibn `Abbas:

That he was asked (regarding): "Except to be kind to me for my Kinship with you.' (42.23) Sa`id bin Zubair (who was present then) said, "It means here (to show what is due for) the relatives of Muhammad." On that Ibn `Abbas said: you have hurried in giving the answer! There was no branch of the tribe of Quraish but the Prophet (ﷺ) had relatives therein. The Prophet (ﷺ) said, "I do not want anything from (you ) except to be Kind to me for my Kinship with you."