Sayyiduna Anas bin Malik, may Allah be pleased with him, narrates this statement of the Noble Prophet, peace and blessings be upon him: "When a person is performing prayer, he should not spit to his right or in front of him because he is supplicating before his Lord; rather, he should spit to his left or beneath his feet."
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 2267
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الصحيحة» (3974): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرطهما.