How can we reconcile the hadith: "Whoever does a favor for you, reciprocate it, and if you cannot find anything to reciprocate with, then supplicate for him until you think that you have reciprocated him," with the hadith: "Whoever intercedes for his brother with an intercession and he gifts him a present for it and he accepts it, then he has approached a great door from the doors of riba (usury/interest)," in the case of a colleague handling personal matters that are not part of his job?

There is no contradiction between the hadith "Whoever does a favor for you, reciprocate it" and the hadith "Whoever intercedes for his brother, and he [the interceded for] gifts him a present for it, and he [the intercessor] accepts it, then he has approached a great door from the doors of usury." The ways to reconcile them are as follows:

1. The hadith of Abi Umamah should be understood in the context of intercession intended solely for the sake of Allah. In this case, it is not permissible for the intercessor to accept a gift for it, so as not to lose his reward with Allah, and so that in his future intercessions, he does not look towards what people possess. 2. The hadith of Abi Umamah should be understood in the context of obligatory intercession, such as removing injustice or restoring rights. In such cases, accepting a gift is not permissible. However, for intercession in non-obligatory matters, such as assisting in completing a legitimate transaction, accepting a gift is permissible, as it is a recompense for a non-obligatory good deed. 3. If the employee performs work and effort, there is no harm in giving him a wage or a gift in exchange for his work. However, if his work is limited solely to intercession, this is a point of contention among scholars, though the Shafi'is and Hanbalis permit it.