(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
It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) saw phlegm on the qiblah side of the mosque, so he scraped it off with his hand, and he (peace and blessings be upon him) said in anger: "When a servant stands and prays, he is speaking intimately with his Lord between himself and the qiblah. When one of you spits, let him spit to his left or under his feet, or do like this." Then he (peace and blessings be upon him) spat into his garment and rubbed it together. Yazid, the narrator, says: Humayd demonstrated it to us.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1201
It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that: We were on a journey; then he narrated the long hadith about the water skins of the polytheist woman. The Messenger of Allah (peace and blessings be upon him) called for a vessel, and he poured water into it from the mouths of the water skins, rinsed his mouth with the water, then put it (the water) back into the mouths of the water skins, then tied their mouths, then released the water skins. Then he said to the people: "Drink yourselves and give (your animals) to drink."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1202
It is narrated from Sayyiduna Jarir (may Allah be pleased with him) that he used to order his family to perform ablution with the leftover water of his miswak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1203