"The Messenger of Allah addressed the people and said: 'Allah, the Mighty and Sublime, has enjoined upon you Hajj.' A man said: 'Every year?' He remained silent until he had repeated it three times. Then he said: 'If I said yes, it would be obligatory, and if it were obligatory you would not be able to do it. Leave me alone so long as I have left you alone. Those who came before you were destroyed because they asked too many questions and differed with their prophets. If I command you to do something then follow it as much as you can, and if I forbid you to do something then avoid it."' (Using translation from Nasāʾī 2619)  

خَطَبَ رَسُولُ اللهِ ﷺ فَقَالَ «إِنَّ اللهَ قَدْ فَرَضَ عَلَيْكُمُ الْحَجَّ» فَقَالَ رَجُلٌ أَفِي كُلِّ عَامٍ؟ فَسَكَتَ عَنْهُ حَتَّى أَعَادَهُ ثَلَاثًا فَقَالَ «لَوْ قُلْتُ نَعَمْ لَوَجَبَتْ وَلَوْ وَجَبَتْ مَا قُمْتُمْ بِهَا ذَرُونِي مَا تَرَكْتُكُمْ فَإِنَّمَا هَلَكَ مَنْ كَانَ قَبْلَكُمْ بِكَثْرَةِ سُؤَالِهِمْ وَاخْتِلَافِهِمْ عَلَى أَنْبِيَائِهِمْ فَإِذَا أَمَرْتُكُمْ بِالشَّيْءِ فَخُذُوا بِهِ مَا اسْتَطَعْتُمْ وَإِذَا نَهَيْتُكُمْ عَنْ شَيْءٍ فَاجْتَنِبُوهُ»  

Allah, Most High, has decreed Hajj for you. Al-Aqra' bin Habis At-Tamimi said: "Every year, O Messenger of Allah?" But he remained silent, then he said: "If I said yes, it would become obligatory, then you would not hear and obey. Rather it is just one Hajj." (Using translation from Nasāʾī 2620)  

أَنَّ رَسُولَ اللهِ ﷺ قَامَ فَقَالَ «إِنَّ اللهَ كَتَبَ عَلَيْكُمُ الْحَجَّ» فَقَالَ الْأَقْرَعُ بْنُ حَابِسٍ التَّمِيمِيُّ كُلُّ عَامٍ يَا رَسُولَ اللهِ؟ فَسَكَتَ ثُمَّ قَالَ «لَوْ قُلْتُ نَعَمْ لَوَجَبَتْ ثُمَّ إِذًا لَا تَسْمَعُونَ وَلَا تُطِيعُونَ وَلَكِنَّهُ حَجَّةٌ وَاحِدَةٌ»