Sharia scholars differed regarding the two rak’ahs for entering the mosque. Some say they are Sunnah and some say they are obligatory. What I go to and say is that these two rak’ahs are not obligatory for anyone who enters the mosque unless he wants to sit in the mosque. If he stands and does not sit, or crosses it and does not sit. In my view, he has the choice if he wishes to kneel on them, and if he wishes, he may not kneel on them, and there is no blame on him, and he is sinning by leaving them if he sits and does not kneel on them, unless he enters the time during which prayer is prohibited, or he is not in a state of purity.