Muwatta Malik, Book 20, Hadith 18 (USC-MSA) ⓘ

Yahya related to me from Malik from Humayd ibn Qays from Ata ibn Rabah that a bedouin came to the Messenger of Allah, may Allah bless him and grant him peace, when he was at Hunayn, and he was wearing a shirt with traces of yellow on it. He said, "Messenger of Allah, I have entered ihram for umra. What should I do?" The Messenger of Allah, may Allah bless him and grant him peace, said to him, "Take off your shirt and wash off this yellowness and do in umra as you would do on hajj."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ حُمَيْدِ بْنِ قَيْسٍ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، أَنَّ أَعْرَابِيًّا، جَاءَ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ بِحُنَيْنٍ وَعَلَى الأَعْرَابِيِّ قَمِيصٌ وَبِهِ أَثَرُ صُفْرَةٍ فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي أَهْلَلْتُ بِعُمْرَةٍ فَكَيْفَ تَأْمُرُنِي أَنْ أَصْنَعَ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ انْزِعْ قَمِيصَكَ وَاغْسِلْ هَذِهِ الصُّفْرَةَ عَنْكَ وَافْعَلْ فِي عُمْرَتِكَ مَا تَفْعَلُ فِي حَجِّكَ ‏" ‏ ‏.‏