That is the Glad Tiding Allah gives to His servants who believe and did righteous deeds. You say: “I do not ask any reward upon it except the love for being close relatives; and whoever earns a good, We will increase goodness for him in it. Indeed, Allah is Oft-Forgiving, Most Appreciative.”
It is told in verses 26:214-215 that you should warn with Adhikr the closest kindred, and you should lower your wings to those who follow you from the believers. Accepting the command of this verse, when Messenger Muhammad warned his people with Adhikr, he faced great opposition from them. Likewise, the believer today, when he warns his close relatives, also faces opposition from them. Then he is commanded to say: “I do not ask any reward from you for conveying the Message of Allah except the bond of love under the Light of Adhikr.” See explanation 9:10; 25:57 and 43:67.