Sayyiduna Amr bin Hazm (may Allah be pleased with him) says: I saw the Prophet (peace and blessings be upon him) spit to the right, to the left and in front of him.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, al-Waqidi, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2012