8:45
O ye who believe! When ye meet a force, be firm, and call Allah in remembrance much (and often); that ye may prosper:
‘Remembering God’ in battle means to shout, “Allahu Akbar” or “God is Great,” and other such phrases.
References:
Emerick, Yahiya. The Meaning of the Holy Qur’an in Today’s English (p. 829). Unknown. Kindle Edition.