The word(s) "left" appears 72 time(s) in 67 verse(s) in Quran in Mohsin Khan translation.

(21) Have they not observed things that Allah has created: (how) their shadows incline to the right and to the left, making prostration unto Allah, and they are lowly?

(22) They assign to Allah that which they dislike (for themselves), and their tongues assert the falsehood that the better things will be theirs. No doubt for them is the Fire, and they will be the first to be hastened on into it, and left there neglected. (Tafsir Al-Qurtubi)

(23) And you might have seen the sun, when it rose, declining to the right from their Cave, and when it set, turning away from them to the left, while they lay in the midst of the Cave. That is (one) of the Ayat (proofs, evidence, signs) of Allah. He whom Allah guides, he is the rightly guided; but he whom He sends astray, for him you will find no Wali (guiding friend) to lead him (to the right Path).

(24) And you would have thought them awake, whereas they were asleep. And We turned them on their right and on their left sides, and their dog stretching forth his two forelegs at the entrance [of the Cave or in the space near to the entrance of the Cave (as a guard at the gate)]. Had you looked at them, you would certainly have turned back from them in flight, and would certainly have been filled with awe of them.

(25) And the Book (one's Record) will be placed (in the right hand for a believer in the Oneness of Allah, and in the left hand for a disbeliever in the Oneness of Allah), and you will see the Mujrimun (criminals, polytheists, sinners), fearful of that which is (recorded) therein. They will say: "Woe to us! What sort of Book is this that leaves neither a small thing nor a big thing, but has recorded it with numbers!" And they will find all that they did, placed before them, and your Lord treats no one with injustice.

(26) "And press your (right) hand to your (left) side: it will come forth white (and shining), without any disease as another sign,

(27) On that Day mankind will follow strictly (the voice of) Allah's caller, no crookedness (that is without going to the right or left of that voice) will they show him (Allah's caller). And all voices will be humbled for the Most Gracious (Allah), and nothing shall you hear but the low voice of their footsteps.

(28) (Allah) will say: "Like this: Our Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) came unto you, but you disregarded them (i.e. you left them, did not think deeply in them, and you turned away from them), and so this Day, you will be neglected (in the Hell-fire, away from Allah's Mercy)."

(29) "So that I may do good in that which I have left behind!" No! It is but a word that he speaks; and behind them is Barzakh (a barrier) until the Day when they will be resurrected.

(30) And let not those among you who are blessed with graces and wealth swear not to give (any sort of help) to their kinsmen, Al-Masakin (the poor), and those who left their homes for Allah's Cause. Let them pardon and forgive. Do you not love that Allah should forgive you? And Allah is Oft-Forgiving, Most Merciful.