Hadith 1:16
Warrad, the scribe of al-Mughira ibn Shu'ba, said, "Mu'awiya wrote to al-Mughira, saying, 'Write down for me what you heard the Messenger of Allah, may Allah bless him and grant him peace, say.'" Warrad said, "He dictated to me and I wrote out, 'I heard him forbid asking too many questions, wasting money and chit-chat.'"
حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، قَالَ: أَخْبَرَنَا جَرِيرٌ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ وَرَّادٍ، كَاتِبِ الْمُغِيرَةِ بْنِ شُعْبَةَ، قَالَ: كَتَبَ مُعَاوِيَةُ إِلَى الْمُغِيرَةِ: اكْتُبْ إِلَيَّ بِمَا سَمِعْتَ مِنْ رَسُولِ اللهِ صلى الله عليه وسلم. قَالَ وَرَّادٌ: فَأَمْلَى عَلَيَّ وَكَتَبْتُ بِيَدَيَّ: إِنِّي سَمِعْتُهُ يَنْهَى عَنْ كَثْرَةِ السُّؤَالِ، وَإِضَاعَةِ الْمَالِ، وَعَنْ قِيلَ وَقَالَ
Original Reference: Al-Adab Al-Mufrad 16