Messenger Muhammad (peace and blessings be upon him) said:
“The first deed that the servant will be called to account for on Resurrection Day is their Salah. If it is good, they will have prospered and succeeded; if it is bad, they will have failed and lost”
(Narrated by Al-Tirmidhi)
Salah is the first deed that a human will be brought to account for on Judgment Day. If the prayers are good and proper, the rest of the deeds become good and proper. But if the prayers are bad and improper, the rest of the deeds become bad and improper, even if they include good actions as high as the mountains.
Rule: The Two Standings – Scholar Ibn Al-Qayyim
A servant has two standings in front of Allah.
A standing in front of Him during Salah (in this life) and a standing in front of Him on the Day of meeting with Him (in the Hereafter).
Whoever fulfills the rights of the first standing, giving it its due right, will have the other standing made easy for them. And whoever takes this standing lightly, failing to give it its due importance, will have the other standing made hard for them.