Sayyiduna Mahmud bin Labid (may Allah be pleased with him) narrates that he remembers that the Prophet (peace and blessings be upon him) spat a mouthful of water into a bucket in their house; that bucket was in their house.
Ahmad recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16138