And (remember) when We said to you, “”Your Fosterer certainly encompasses mankind.”” And We did not make the vision {1} which We showed you but a trial for mankind and (also) the cursed tree (mentioned) in the Quran, and We cause them to fear, but it increases them in nothing except a great rebellion. (R 6)
These verses probably refer to the event of Mairaj. The summary of details narrated by Muslim and Bukhari are:
1. Jibrael opened the chest of prophet Muhammed (PBH), removed and washed his heart to free it from evil and rejoined the chest after replacing the heart.
2. He was then carried on Buraq (Barq means lightning) from Kaaba in Mecca to Masjid-i-Aqsa at Jerusalem where he worshipped (offered salat),
3. He was then taken beyond the regions of the earth. On the 1st level of the sky he met Adam, on the 2nd level Isa and Yahya on the 3rd level Yusuf on the 4th level Idris on the 5th level Harun on the 6th level Musa and on the 7th level Ibrahim (PBT). Finally, he got the order making worship (salat) obligatory on every muslim five times a day and returned to the place on earth from where he was taken. All this happened in a very short period of time. Removal and replacement of heart, space travel and high speeds should not surprise us because it is a common feature today. When man who is created by Allah can do this every day then it must be much more easier for Allah.

