Does the reward of a man who goes out to pray in the mosque decrease if he attends to some worldly affairs on his way, such as stopping at a shop or inquiring about a commodity?

If a man leaves his home to pray in the mosque, and then an unforeseen matter arises on his way, which he attends to, such as buying something from a shop, this does not diminish his reward in any way. This is because his primary intention is prayer, as stated in the Hadith: "A man’s prayer in congregation is twenty-five times more virtuous than his prayer at home or in his marketplace. This is because when he performs ablution well, then leaves for the mosque, with nothing urging him out but prayer, he does not take a single step but that a degree is raised for him and a sin is removed from him."