Is it permissible to enter the mosque with a wheelchair and pray in the front rows, knowing that some common people prevent that?

It is permissible for a sick person to enter the mosque and pray in the first row while seated on a chair, as long as it does not cause harm or create a gap in the row. It is preferable for him to pray to the right or left of the row if his sitting causes a gap. If he fears that his praying in the first row might cause discord, it is better for him to move back to prevent harm, and he will still receive full reward. He should strive to explain the Islamic ruling to people.