Indeed, these people like hasten, and are ignoring a Heavy Day behind them.
Today “theses people” are those who read these verses, but are leading a life just opposite to what they read and hear. They are carrying Lord’s Book as donkeys carrying the burden as explained in verse 62: 5. Here mentioned “Hasten” means this temporary world, whereas “Heavy Day” means “death” in the case of individual whereas concerning all mankind, it is the Dooms Day or Day of Judgement.
The real disbelievers mentioned in the verses 4: 150-151 are leading an aimless life here, but they are calculating that they are in the Straight path. At the time of their death, they will see Satan and the Hellfire. Then Lord will tell them “You received My verses, but you rejected them, and you were arrogant, you were among the disbelievers” as told in verses 39: 58-59. See explanation 7: 37, 187; 70: 4; 74: 42-47 and 75: 20-21, 26-36.