It is narrated from Aishah bint Sa'd bin Abi Waqqas (may Allah be pleased with her) that Sa'd (may Allah be pleased with him) washed Sa'id bin Zayd (may Allah be pleased with him) and applied perfume to him, then came home and took a ritual bath, and said to us: I did not take a bath because of washing him; rather, I took a bath because of the heat.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1469