Subḥānallāh!
(Glory is to Allah).
Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 1/210, 390, 414 and Muslim 4/1857.
Allāhu Akbar!
(Allah is the Most Great)
Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 8/441. See also Al-Albani, Sahih
At-Tirmidhi 2/103, 235, Ahmad 5/218.