Through the same chain, it is narrated from Sayyiduna Samurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you spits while he is in his prayer, let him not spit in front of his face or to his right; rather, let him spit beneath his foot, then rub it into the ground."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 7008