Hadith record

Hadith.918 - Hisham ibn al-Hakam narrated from Abu Al-Hasan Imam Musa ibn Jafar Al-Kadhim (as), that He said: "There is another reason (for the seven takbirs), which is that when The Prophet (sw) was taken up to the heavens (during the Miʿrāj), he passed through seven veils (ḥujub). At each veil, He said a takbir (declaring 'Allahu Akbar'). Thus, Allah (swt) (the Almighty and Glorious) brought him to the highest level of honor through these takbirs."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.