مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3667
The Offices of Commander and Qadi
Section 1
وَعَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: كُنَّا إِذَا بَايَعْنَا رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَى السَّمْعِ وَالطَّاعَةِ يَقُولُ لَنَا: «فِيمَا اسْتَطَعْتُمْ»
Ibn ‘Umar told that when they swore allegiance to God’s Messenger to hear and obey he was saying to them, “In what you are able.” (Bukhari and Muslim.)
Mishkat al-Masabih, 3667مُتَّفَقٌ عَلَيْهِ (الألباني)