[Machine] He should not ride on anything made of camel leather except out of necessity. I found this in my book and it has been removed from its chain of narrators between Ibrahim and Ata. The narration of Ibn Uyaynah is the most authentic.
أَنْ يَرْكَبَ إِلَى شَيْءٍ مِنَ الْجِمَارِ إِلَّا مِنْ ضَرُورَةٍ كَذَا وَجَدْتُهُ فِي كِتَابِي وَقَدْ سَقَطَ مِنْ إِسْنَادِهِ بَيْنَ إِبْرَاهِيمَ وَعَطَاءٍ رَجُلٌ وَرِوَايَةُ ابْنِ عُيَيْنَةَ أَصَحُّ