The word(s) "grieve" appears 42 time(s) in 41 verse(s) in Quran in Mohsin Khan translation.

(31) And We inspired the mother of Musa (Moses): (telling): "Suckle him [Musa (Moses)], but when you fear for him, then cast him into the river and fear not, nor grieve. Verily, We shall bring him back to you, and shall make him one of (Our) Messengers." [Tafsir Al-Qurtubi]

(32) So did We restore him to his mother, that her eye might be comforted, and that she might not grieve, and that she might know that the Promise of Allah is true. But most of them know not.

(33) And when Our Messengers came to Lut (Lot), he was grieved because of them, and felt straitened on their account. They said: "Have no fear, and do not grieve! Truly, we shall save you and your family, except your wife: she will be of those who remain behind (i.e. she will be destroyed along with those who will be destroyed from her folk).

(34) And whoever disbelieves, let not his disbelief grieve you (O Muhammad صلى الله عليه وسلم). To Us is their return, and We shall inform them what they have done. Verily, Allah is the All-Knower of what is in the breasts (of men).

(35) You (O Muhammad صلى الله عليه وسلم) can postpone (the turn of) whom you will of them (your wives), and you may receive whom you will. And whomsoever you desire of those whom you have set aside (her turn temporarily), it is no sin on you (to receive her again): that is better that they may be comforted and not grieved, and may all be pleased with what you give them. Allah knows what is in your hearts. And Allah is Ever All-Knowing, Most Forbearing.

(36) So let not their speech, then, grieve you (O Muhammad صلى الله عليه وسلم). Verily, We know what they conceal and what they reveal.

(37) And Allah will deliver those who are the Muttaqun (the pious - See V.2:2) to their places of success (Paradise). Evil shall touch them not, nor shall they grieve.

(38) Verily, those who say: "Our Lord is Allah (Alone)," and then they stand firm, on them the angels will descend (at the time of their death) (saying): "Fear not, nor grieve! But receive the glad tidings of Paradise which you have been promised!

(39) (It will be said to the true believers of Islamic Monotheism): My worshippers! No fear shall be on you this Day, nor shall you grieve,

(40) Verily, those who say: "Our Lord is (only) Allah," and thereafter stand firm and straight on the Islamic Faith of Monotheism, on them shall be no fear, nor shall they grieve.