(a) It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) spat into his garment while in prayer.
(b) In the hadith of Qabisah it says that the Messenger of Allah (peace and blessings be upon him) spat into his garment.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1200