Muwatta Malik· موطأ مالك
Muwatta Malik 371
Yahya related to me from Malik that he had heard that Abdullah ibn Umar would…
মুয়াত্তা ইমাম মালিক ৩৭১ · মুয়াত্তা মালিক•Shortening the Prayer
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَسْتَتِرُ بِرَاحِلَتِهِ إِذَا صَلَّى .
Narrator: Yahya
Yahya related to me from Malik that he had heard that Abdullah ibn Umar would use the animal he was riding as a sutra when he prayed- Salim al-HilaliMauquf Sahih