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:1711bIbn Abū ʿUmar > Sufyān b. ʿUyaynah > ʿUbaydullāh > Bimaʿnāh Ilā > ʿUmar b. ʿAbd al-ʿAzīz Hadhā Ḥad Mā Bayn al-Dhurriyyah And al-Muqātilah Walam > Katab

"Umar [bin 'Abdul-'Aziz] said: 'This is the limit that distinguished between children and soldiers.'" And he did not mention him writing about the salary  

[Abu 'Eisa said:] The Hadith of Ishaq bin Yusuf is a Hasan Sahih Gharib Hadith as narration of Sufyan Ath-Thawri
الترمذي:١٧١١bحَدَّثَنَا ابْنُ أَبِي عُمَرَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ عَنْ عُبَيْدِ اللَّهِ نَحْوَهُ بِمَعْنَاهُ إِلاَّ أَنَّهُ قَالَ قَالَ عُمَرُ بْنُ عَبْدِ الْعَزِيزِ هَذَا حَدُّ مَا بَيْنَ الذُّرِّيَّةِ وَالْمُقَاتِلَةِ وَلَمْ يَذْكُرْ أَنَّهُ كَتَبَ أَنْ يُفْرَضَ
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قَالَ أَبُو عِيسَى حَدِيثُ إِسْحَاقَ بْنِ يُوسُفَ حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ مِنْ حَدِيثِ سُفْيَانَ الثَّوْرِيِّ