Translation:

77. "But seek with the (wealth) which Allah has bestowed on thee the Home of the Hereafter nor forget thy portion in this world: but do thou good as Allah has been good to thee and seek not (occasions for) mischief in the land: for Allah loves not those who do mischief."

Notes (Tafseer)

3407. That is, 'spend your wealth in charity and good works. It is Allah Who has given it to you, and you should spend it in Allah's cause. Nor should you forget the legitimate needs of this life, as misers do, and most people become misers who think too exclusively of their wealth'. If wealth is not used properly, there are three evils that follow: (1) its possessor may be a miser and forget all claims due to himself and those about him; (2) he may forget the higher needs of the poor and needy, or the good causes which require support; and (3) he may even misspend on occasions and cause a great deal of harm and mischief. Apparently Qarun had all three vices.