When they neglected the warning they had received, then, instead of punishment, We opened the gates of every kind of prosperity for them; but just as they were rejoicing in what they were given, We suddenly seized them; lo! They were plunged into despair!
Meaning:-
Neglected: to ignore or disregard, carelessness, fail to care for properly.
Rejoicing: great joy,feel or show great joy or delight.
Plunge: drop. To dive, jump, push,
Despair: the complete loss or absence of hope.