A man prayed the 'Asr prayer, then another man entered the mosque. Is it permissible for him to pray with him as a voluntary act?

Question : Shaykh, if a person prays, for example, the 'Asr prayer, and then another person says to him, "Pray with me so that we can obtain the reward of the congregation," is this a weakening of the reason?

Answer : Yes, that is correct. I mean, if he prays 'Asr and then another person enters and stands to pray with him, giving him charity, then it is permissible for him to have a reason.