رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 961
The Book of Etiquette of Traveling
The Desirability of undertaking a Journey in a Group and appointing a Leader
وَعَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: “خَيْرُ الصَّحَابَةِ أَرْبَعَةٌ وَخَيْرُ السَّرَايَا أَرْبَعُمِائَةٍ وَخَيْرُ الْجُيُوشِ أَرْبَعَةُ آلاَفٍ وَلَنْ يُغْلَبَ اثْنَا عَشَرَ أَلْفًا عَنْ قلة" ((رَوَاهُ أَبُو دَاوُدَ وَالتِّرْمِذِيُّ وَقَالَ: حَدِيث حَسَن))
Ibn 'Abbas (May Allah be pleased with them) reported: The Prophet (ﷺ) said, "The best number of companions is four; the best detachment is four hundred and the best army is four thousand; and twelve thousand men will not be defeated as a result of smallness of number." [At-Tirmidhi and Abu Dawud].
Riyad as-Salihin, 961