The hadith of Sayyiduna Ibn Abbas and Sayyiduna Rifa'ah (may Allah be pleased with them) regarding prostrating on the forehead has already passed.
Likewise, the hadith of Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) has also passed, in which his prostrating on his forehead in mud is mentioned.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / Q2657