The ruling on giving an employee a gift after he has performed a service that benefits the giver

Question:
In some government offices, such as traffic police departments for example, the relevant employee performed a service for me, and he did not falsify anything for me. After he completed this service and finished it, I gave him a sum of money as a gift. Is this lawful or forbidden?

Answer:
I do not know of any harm in this, if the gift was given after your need was met, without any collusion between you and him and no prior agreement, then we do not know of any harm in this; because this falls under the category of repaying kindness with kindness. And he (peace and blessings be upon him) said in the hadith: So if someone does a favor, there is no harm in rewarding him, with money or with supplication. However, leaving it out is safer so that it does not become a custom in such cases, where everyone assumes that the person will give him and seek from him afterwards or ask him afterwards. So the result is that leaving this out is safer, otherwise there is no harm in it if it is without agreement or collusion. As for with collusion or prior agreement, that is the forbidden bribe. Yes. May Allah bless you.