It is narrated from Sayyiduna Ali (may Allah be pleased with him) that when the following verse was revealed: «﴿وَلِلّٰهِ عَلَى النَّاسِ حِجُّ الْبَيْتِ مَنِ اسْتَطَاعَ إِلَيْهِ سَبِيلًا﴾ [آل عمران: 97] » , the people asked: "O Messenger of Allah! Is performing Hajj every year obligatory?" The Prophet (peace and blessings be upon him) remained silent. After the question was asked three times and the Prophet (peace and blessings be upon him) remained silent, he said: "No, and if I had said yes, then performing Hajj every year would have become obligatory." And in this context, this verse was revealed: «﴿يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَسْأَلُوا عَنْ أَشْيَاءَ إِنْ تُبْدَ لَكُمْ تَسُؤْكُمْ .....﴾ [المائدة: 101] » "O you who believe! Do not ask about things which, if made plain to you, may cause you trouble...... ."