Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: "When you prostrate, place your nose on the ground along with your forehead." In al-Saffar's hadith, in place of 'ma'a jabhatika' (along with your forehead) the words are 'thumma jabhataka', meaning "then place your forehead."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2655