Prayer is the last part of religion to be lost, and if it is lost the whole religion is lost.

Prayer is the last part of religion to be lost, and if it is lost the whole religion is lost.

It was narrated that Jaabir ibn ‘Abd-Allaah (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Between a man and shirk [associating others with Allaah] and kufr [disbelief] there stands his giving up prayer.” Narrated by Muslim, 82.

Hence the Muslim should be keen to perform the prayers on time, and not be lazy or take the matter lightly.

Allaah says (interpretation of the meaning):
“So woe unto those performers of Salaah (prayers) (hypocrites),
Those who delay their Salaah (prayer from their stated fixed times)”
[al-Maa’oon 107:4-5]

And Allaah warns those who cause their prayers to be lost by saying (interpretation of the meaning):

Then, there has succeeded them a posterity who have given up As-Salaat (the prayers) [i.e. made their Salaat (prayers) to be lost, either by not offering them or by not offering them perfectly or by not offering them in their proper fixed times] and have followed lusts. So they will be thrown in Hell”
[Maryam 19:59]