The word(s) "middle" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) Guard strictly (five obligatory) As-Salawat (the prayers) especially the middle Salat (i.e. the best prayer - 'Asr ) . And stand before Allah with obedience [and do not speak to others during the Salat (prayers)].

(2) Then We gave the Book (the Qur'an) as inheritance to such of Our slaves whom We chose (the followers of Muhammad صلى الله عليه وسلم). Then of them are some who wrong their ownselves, and of them are some who follow a middle course, and of them are some who are, by Allah's Leave, foremost in good deeds. That (inheritance of the Qur'an) - that is indeed a great grace.