Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: We have been commanded to prostrate on seven bones and not to tuck up hair or garment (during the prayer).
Imam al-Tabarani recorded this narration in al-Mu'jam al-Kabir. Its chain contains a narrator, Isma'il bin Amr al-Bajali, whom Imam Abu Hatim and al-Daraqutni declared da'if (weak). Ibn Hibban mentioned him in his book al-Thiqat.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2747
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«المعجم الكبير للطبرانى من اسمه عبد الله طرق حديث عبد الله بن مسعود ليلة الجن مع رسول الله باب 10261 ، أخرجه المعجم الكبير للطبراني برقم: 10456»