[Machine] Al-Shafi'i in his Sunan Haramlah argues that excuse can be granted due to travel or rain. However, this is not a fixed ruling confirmed by Umar. The Sheik states that it is as Al-Shafi'i said, and the famous chain of transmission for this narration is what we have mentioned, but it is also a mursal narration from Abu Al-Alaya. He did not hear this from Umar. In another chain of transmission, it has been narrated that Al-Shafi'i referred to his text in some of his books.  

الشَّافِعِيُّ فِي سُنَنِ حَرْمَلَةَ الْعُذْرُ يَكُونُ بِالسَّفَرِ وَالْمَطَرِ وَلَيْسَ هَذَا بِثَابِتٍ عَنْ عُمَرَ هُوَ مُرْسَلٌ قَالَ الشَّيْخُ هُوَ كَمَا قَالَ الشَّافِعِيُّ وَالْإِسْنَادُ الْمَشْهُورُ لِهَذَا الْأَثَرِ مَا ذَكَرْنَا وَهُوَ مُرْسَلٌ أَبُو الْعَالِيَةِ لَمْ يَسْمَعْ مِنْ عُمَرَ ؓ وَقَدْ رُوِيَ ذَلِكَ بِإِسْنَادٍ آخَرَ قَدْ أَشَارَ الشَّافِعِيُّ إِلَى مَتْنِهِ فِي بَعْضِ كُتُبِهِ