Do you not see that Allah is He whom do glorify all those who are in the heavens and the earth, and the (very) birds with expanded wings? He knows the prayer of each one and its glorification, and Allah is cognizant of what they do.
And unto Allah falls in prostration whoever is in the heavens and the earth, willingly or unwillingly, and so do their shadows in the mornings and afternoons.
Recite that which has been revealed to you of the Book and keep up prayer; surely prayer keeps (one) away from indecency and evil, and certainly the remembrance of Allah is greatest, and Allah knows what you do
Verily the prayers at fixed hours have been prescribed for the believers
"The covenant (which distinguished) between us and them is Prayer, so whoever abandoned it committed an act of disbelief."
But after them followed a posterity who missed prayers and followed after lusts soon, then, will they face destruction
And in sura 107: 4 and 5
So, woe to the worshipers who are neglectful of their prayers