Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tirmidhi:1598Wāṣil

"We used to say that the participants of Badr on the Day of Badr were like the number of companions of Talut, three hundred and thirteen men." [He said:] There is something on this topic from Ibn 'Abbas.  

[Abu 'Eisa said:] This Hadith is Hasan Sahih. Ath-Thawri and others reported it from Abu Ishaq.
الترمذي:١٥٩٨حَدَّثَنَا وَاصِلُ بْنُ عَبْدِ الأَعْلَى الْكُوفِيُّ حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ عَنْ أَبِي إِسْحَاقَ عَنِ الْبَرَاءِ قَالَ كُنَّا نَتَحَدَّثُ

أَنَّ أَصْحَابَ بَدْرٍ يَوْمَ بَدْرٍ كَعِدَّةِ أَصْحَابِ طَالُوتَ ثَلاَثِمِائَةٍ وَثَلاَثَةَ عَشَرَ رَجُلاً قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ وَقَدْ رَوَاهُ الثَّوْرِيُّ وَغَيْرُهُ عَنْ أَبِي إِسْحَاقَ