The word(s) "when" appears 926 time(s) in 834 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) And when Musa said to his people: Surely Allah commands you that you should sacrifice a cow; they said: Do you ridicule us? He said: I seek the protection of Allah from being one of the ignorant.

(22) And when you killed a man, then you disagreed with respect to that, and Allah was to bring forth that which you were going to hide.

(23) And when they meet those who believe they say: We believe, and when they are alone one with another they say: Do you talk to them of what Allah has disclosed to you that they may contend with you by this before your Lord? Do you not then understand?

(24) And when We made a covenant with the children of Israel: You shall not serve any but Allah and (you shall do) good to (your) parents, and to the near of kin and to the orphans and the needy, and you shall speak to men good words and keep up prayer and pay the poor-rate. Then you turned back except a few of you and (now too) you turn aside.

(25) And when We made a covenant with you: You shall not shed your blood and you shall not turn your people out of your cities; then you gave a promise while you witnessed.

(26) And most certainly We gave Musa the Book and We sent apostles after him one after another; and We gave Isa, the son of Marium, clear arguments and strengthened him with the holy spirit, What! whenever then an apostle came to you with that which your souls did not desire, you were insolent so you called some liars and some you slew.

(27) And when there came to them a Book from Allah verifying that which they have, and aforetime they used to pray for victory against those who disbelieve, but when there came to them (Prophet) that which they did not recognize, they disbelieved in him; so Allah's curse is on the unbelievers.

(28) And when it is said to them, Believe in what Allah has revealed, they say: We believe in that which was revealed to us; and they deny what is besides that, while it is the truth verifying that which they have. Say: Why then did you kill Allah's Prophets before if you were indeed believers?

(29) And when We made a covenant with you and raised the mountain over you: Take hold of what We have given you with firmness and be obedient. They said: We hear and disobey. And they were made to imbibe (the love of) the calf into their hearts on account of their unbelief. Say: Evil is that which your belief bids you if you are believers.

(30) What! whenever they make a covenant, a party of them cast it aside? Nay, most of them do not believe.