Humayd narrates: When Sayyiduna Anas bin Malik (may Allah be pleased with him) passed away, a vial was also placed in his hanut (embalming perfume), in which the sweat of the Prophet (peace and blessings be upon him) was mixed.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 4073