The word(s) "weak" appears 45 time(s) in 41 verse(s) in Quran in Mohsin Khan translation.

(31) Allah is He Who created you in (a state of) weakness, then gave you strength after weakness, then after strength gave (you) weakness and grey hair. He creates what He wills. And it is He Who is the All-Knowing, the All-Powerful (i.e. Able to do all things).

(32) And We have enjoined on man (to be dutiful and good) to his parents. His mother bore him in weakness and hardship upon weakness and hardship, and his weaning is in two years - give thanks to Me and to your parents. Unto Me is the final destination.

(33) And those who disbelieve say: "We believe not in this Qur'an nor in that which was before it." But if you could see when the Zalimun (polytheists and wrong-doers) will be made to stand before their Lord, how they will cast the (blaming) word one to another! Those who were deemed weak will say to those who were arrogant: "Had it not been for you, we should certainly have been believers!"

(34) And those who were arrogant will say to those who were deemed weak: "Did we keep you back from guidance after it had come to you? Nay, but you were Mujrimun (polytheists, sinners, disbelievers, criminals)."

(35) Those who were deemed weak will say to those who were arrogant: "Nay, but it was your plotting by night and day: when you ordered us to disbelieve in Allah and set up rivals to Him!" And each of them (parties) will conceal their own regrets (for disobeying Allah during this worldly life), when they behold the torment. And We shall put iron collars round the necks of those who disbelieved. Are they requited aught except what they used to do?

(36) And he whom We grant long life - We reverse him in creation (weakness after strength). Will they not then understand?

(37) And, when they will dispute in the Fire, the weak will say to those who were arrogant: "Verily, we followed you: can you then take from us some portion of the Fire?"

(38) And those who disbelieve (the strong and wealthy) say of those who believe (the weak and poor): "Had it (Islamic Monotheism to which Muhammad صلى الله عليه وسلم is inviting mankind) been a good thing, they (the weak and poor) would not have preceded us thereto!" And when they have not let themselves be guided by it (this Qur'an), they say: "This is an ancient lie!"

(39) So be not weak and ask not for peace (from the enemies of Islam) while you are having the upper hand. Allah is with you, and He will never decrease the reward of your good deeds.

(40) Till, when they see that which they are promised, then they will know who it is that is weaker concerning helpers and less important concerning numbers.