These three ayaat are as follows:
“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. The Messenger (Muhammad) believes in what has been sent down to him from his Lord, and (so do) the believers. Each one believes in Allah, His Angels, His Books, and His Messengers. They say, “We make no distinction between one another of His Messengers” – and they say, “We hear, and we obey. (We seek) Your Forgiveness, our Lord, and to You is the return (of all).” Allah burdens not a person beyond his scope. He gets reward for that (good) which he has earned, and he is punished for that (evil) which he has earned. “Our Lord! Punish us not if we forget or fall into error, our Lord! Lay not on us a burden like that which You did lay on those before us (Jews and Christians); our Lord! Put not on us a burden greater than we have strength to bear. Pardon us and grant us Forgiveness. Have mercy on us. You are our Maula (Patron, Supporter and Protector, etc.) and give us victory over the disbelieving people.”” [Surah Al-Baqarah (2) :284-286]
Ibn Abbas reported that while Jibreel was sitting with the Apostle (may peace be upon him) he heard a creaking sound above him. He lifted his head and said:” This is a gate opened in heaven today which had never been opened before. Then when an angel descended through it, he said: This is an angel who came down to the earth who had-never come down before. He greeted and said: Rejoice in two lights given to you which have not been given to any prophet before you: Fatihat al-Kitab and the concluding verses of Sarah al-Baqarah. You will never recite a letter from them for which you will not be given (a reward).” [Saheeh Muslim, Hadeeth No. 1760]
These two ayaat are also from amongst those ayaat which should be recited before sleeping.
Here’s a brief tafsir of these ayaat from Imam As-Saadi: