Sahih al-Bukhari 2964
Narrated `Abdullah:
Today a man came to me and asked me a question which I did not know how to answer. He said, "Tell 
me, if a wealthy active man, well-equipped with arms, goes out on military expeditions with our 
chiefs, and orders us to do such things as we cannot do (should we obey him?)" I replied, "By Allah, I 
do not know what to reply you, except that we, were in the company of the Prophet (ﷺ) and he used to 
order us to do a thing once only till we finished it. And no doubt, everyone among you will remain in 
a good state as long as he obeys Allah. If one is in doubt as to the legality of something, he should ask 
somebody who would satisfy him, but soon will come a time when you will not find such a man. By 
Him, except Whom none has the right to be worshipped. I see that the example of what has passed of 
this life (to what remains thereof) is like a pond whose fresh water has been used up and nothing 
remains but muddy water."
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ عَبْدُ اللَّهِ ـ رضى الله عنه ـ لَقَدْ أَتَانِي الْيَوْمَ رَجُلٌ فَسَأَلَنِي عَنْ أَمْرٍ مَا دَرَيْتُ مَا أَرُدُّ عَلَيْهِ، فَقَالَ أَرَأَيْتَ رَجُلاً مُؤْدِيًا نَشِيطًا، يَخْرُجُ مَعَ أُمَرَائِنَا فِي الْمَغَازِي، فَيَعْزِمُ عَلَيْنَا فِي أَشْيَاءَ لاَ نُحْصِيهَا‏.‏ فَقُلْتُ لَهُ وَاللَّهِ مَا أَدْرِي مَا أَقُولُ لَكَ إِلاَّ أَنَّا كُنَّا مَعَ النَّبِيِّ صلى الله عليه وسلم فَعَسَى أَنْ لاَ يَعْزِمَ عَلَيْنَا فِي أَمْرٍ إِلاَّ مَرَّةً حَتَّى نَفْعَلَهُ، وَإِنَّ أَحَدَكُمْ لَنْ يَزَالَ بِخَيْرٍ مَا اتَّقَى اللَّهَ، وَإِذَا شَكَّ فِي نَفْسِهِ شَىْءٌ سَأَلَ رَجُلاً فَشَفَاهُ مِنْهُ، وَأَوْشَكَ أَنْ لاَ تَجِدُوهُ، وَالَّذِي لاَ إِلَهَ إِلاَّ هُوَ مَا أَذْكُرُ مَا غَبَرَ مِنَ الدُّنْيَا إِلاَّ كَالثَّغْبِ شُرِبَ صَفْوُهُ وَبَقِيَ كَدَرُهُ‏.‏