The word(s) "conceal" appears 43 time(s) in 43 verse(s) in Quran in Mohsin Khan translation.

(11) If you disclose your Sadaqat (alms-giving), it is well; but if you conceal them and give them to the poor, that is better for you. (Allah) will expiate you some of your sins. And Allah is Well-Acquainted with what you do.

(12) And if you are on a journey and cannot find a scribe, then let there be a pledge taken (mortgaging) ; then if one of you entrust the other, let the one who is entrusted discharge his trust (faithfully), and let him be afraid of Allah, his Lord. And conceal not the evidence for he, who hides it, surely his heart is sinful. And Allah is All-Knower of what you do.

(13) To Allah belongs all that is in the heavens and all that is on the earth, and whether you disclose what is in your ownselves or conceal it, Allah will call you to account for it. Then He forgives whom He wills and punishes whom He wills. And Allah is Able to do all things.

(14) O people of the Scripture (Jews and Christians): "Why do you mix truth with falsehood and conceal the truth while you know?"

(15) O you who believe! Take not as (your) Bitanah (advisors, consultants, protectors, helpers, friends) those outside your religion (pagans, Jews, Christians, and hypocrites) since they will not fail to do their best to corrupt you. They desire to harm you severely. Hatred has already appeared from their mouths, but what their breasts conceal is far worse. Indeed We have made plain to you the Ayat (proofs, evidence, verses) if you understand.

(16) And that He might test the hypocrites, it was said to them: "Come, fight in the Way of Allah or (at least) defend yourselves." They said: "Had we known that fighting will take place, we would certainly have followed you." They were that day, nearer to disbelief than to Faith, saying with their mouths what was not in their hearts. And Allah has full knowledge of what they conceal.

(17) Whether you (mankind) disclose (by good words of thanks) a good deed (done to you in the form of a favour by someone), or conceal it, or pardon an evil, ... verily, Allah is Ever Oft-Pardoning, All-Powerful.

(18) Verily, those who disbelieve [by concealing the truth about Prophet Muhammad صلى الله عليه وسلم and his message of true Islamic Monotheism written in the Taurat (Torah) and the Injeel (Gospel) with them] and prevent (mankind) from the Path of Allah (Islamic Monotheism); they have certainly strayed far away. (Tafsir Al-Qurtubi).

(19) Verily, those who disbelieve and did wrong [by concealing the truth about Prophet Muhammad صلى الله عليه وسلم and his message of true Islamic Monotheism written in the Taurat (Torah) and the Injeel (Gospel) with them]; Allah will not forgive them, nor will He guide them to any way - (Tafsir Al-Qurtubi).

(20) The duty of the Messenger [i.e. Our Messenger Muhammad صلى الله عليه وسلم whom We have sent to you, (O mankind)] is nothing but to convey (the Message). And Allah knows all that you reveal and all that you conceal.