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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:242 – Khalaf b. al-Walīd > Khālid > Khālid > Abū ʿUthmānaʿan ʿUmar

The Messenger of Allah ﷺ granted a concession allowing silk the width of two fingers.  

أحمد:٢٤٢ – حَدَّثَنَا خَلَفُ بْنُ الْوَلِيدِ حَدَّثَنَا خَالِدٌ عَنْ خَالِدٍ عَنْ أَبِي عُثْمَانَعَنْ عُمَرَ

أَنَّ رَسُولَ اللهِ ﷺ رَخَّصَ فِي الْحَرِيرِ فِي إِصْبَعَيْنِ  

See similar narrations below:

Collected by Ibn Ḥibbān

ذِكْرُ الْإِبَاحَةِ لِلْمَرْءِ لُبْسَ الثِّيَابِ الَّتِي لَهَا أَعْلَامٌ إِذَا كَانَتْ يَسِيرَةً لَا تُلْهِيهِ

ibnhibban:5424 – Shabāb b. Ṣāliḥ Biwāsiṭ > Wahbb. Baqiyyah > Khālid > Khālid > Abū ʿUthmān al-Nahdī > ʿUmar b. al-Khaṭṭāb

[Machine] "That the Prophet ﷺ permitted the use of the index and middle finger."  

ابن حبّان:٥٤٢٤ – أَخْبَرَنَا شَبَابُ بْنُ صَالِحٍ بِوَاسِطَ قَالَ حَدَّثَنَا وَهْبُ بْنُ بَقِيَّةَ قَالَ أَخْبَرَنَا خَالِدٌ عَنْ خَالِدٍ عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ عَنْ عُمَرَ بْنِ الْخَطَّابِ

«أَنَّ النَّبِيَّ ﷺ رَخَّصَ فِي الْعَلَمِ فِي إِصْبَعَيْنِ»