It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that he said: "A person in the state of ihram may take a bath, and he may also wash his (ihram) clothes if he wishes."
This report is sahih (authentic) in its chain, and it is the Companion's own statement (mawquf).
A report with the same meaning is also narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both), in which he stated the same ruling.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الحج / 1190
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: هَذَا صَحِيحٌ مَوْقُوفٌ . » «أخرجه السنن الكبرى للبيهقي برقم: 9180، وأخرجه مصنف ابن أبي شيبة برقم: 15080»