[Machine] I had two paternal uncles who used to trim their mustache and nails every Friday. As for the hadith narrated from Ibn Abbas, it is raised that a believer on Friday is like a pilgrim. He does not trim his nails or hair until the prayer is done. And about Ibn Umar, it is raised that a Muslim on Friday is considered in a state of ihram, so once he prays, he is allowed to trim. However, these two narrations were reported with weak chains of narrators, and they cannot be relied upon as evidence. And with Allah is the Tawfeeq (success).  

كَانَ لِي عَمَّانِ قَدْ شَهِدَا الشَّجَرَةَ يَأْخُذَانِ مِنْ شَوَارِبِهِمَا وَأَظْفَارِهِمَا كُلَّ جُمُعَةٍ فَأَمَّا الْحَدِيثُ الَّذِي رُوِيَ عَنِ ابْنِ عَبَّاسٍ مَرْفُوعًا فِي الْمُؤْمِنُ يَوْمَ الْجُمُعَةِ كَهَيْئَةِ الْمُحْرِمِ لَا يَأْخُذُ مِنْ أَظْفَارِهِ وَلَا مِنْ شَعْرِهِ حَتَّى تَنْقَضِيَ الصَّلَاةُ وَعَنِ ابْنِ عُمَرَ مَرْفُوعًا الْمُسْلِمُ يَوْمَ الْجُمُعَةِ مُحْرِمٌ فَإِذَا صَلَّى فَقَدْ أَحَلَّ فَإِنَّمَا رُوِيَا عَنْهُمَا بِإِسْنَادَيْنِ ضَعِيفَيْنِ لَا يُحْتَجُّ بِمِثْلِهِمَا وَفِي الرِّوَايَةِ الصَّحِيحَةِ عَنِ ابْنِ عُمَرَ مِنْ فِعْلِهِ دَلِيلٌ عَلَى ضَعْفِ مَا يُخَالِفُهُ وَبِاللهِ التَّوْفِيقُ