Sayyiduna Anas (may Allah be pleased with him) reports the following as a marfu' hadith (attributed to the Prophet): The Prophet (peace and blessings be upon him) said: "Three things are part of coarseness (jafa'): that a man blows in his prostration, or that a man wipes his forehead before he has finished his prayer." Imam Bazzar says: The third one has slipped my memory.
Bazzar recorded it; its chain contains al-Jald bin Ayyub, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2455