CARELESSNESS in RUKOO’ or EXAGGERATION therein

The Prophet (peace and blessings of Allaah be upon him) commanded us to do RUKOO’ and SUJOOD perfectly and completely.

It was reported from Anas ibn Maalik (may Allaah be pleased with him) that he heard the Prophet (peace and blessings of Allaah be upon him) said : “Do your rukoo’ and sujood perfectly and completely, for by the One in Whose Hand is my soul, I can see you behind me when you do rukoo’ and sujood.”

(Narrated by al-Bukhaari, 6268; Muslim, 425)
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Part of doing rukoo’ and sujood properly and correctly is to
BE AT EASE in both.

It was reported from Abu Hurayrah that a man entered the
mosque and prayed.

The Messenger of Allaah (peace and blessings of Allaah be upon him) was sitting in a corner of the mosque, and the man came
and greeted him with salaam.

The Prophet (peace and blessings of Allaah be upon him)
answered “ Wa ‘alayk (and also upon you).
GO BACK AND PRAY, for you have not prayed.”

So he went back and prayed, then he came and greeted the
Prophet (peace and blessings of Allaah be upon him) with salaam, and the Prophet (peace and blessings of Allaah be upon him) answered, “Wa ‘alayk (and also upon you). Go back and pray, for you have not prayed yet.”

The third time this happened, the man said, “Teach me, O Messenger of Allaah.”

He said: “When you stand up to pray, do wudoo’ properly, then face the Qiblah and say ‘Allaahu akbar.’ Then recite whatever you can of Qur’aan. Then do rukoo’ until you are at ease in rukoo’. Then stand up until you are at ease in standing, then do sujood until you are at ease in sujood. Then sit up until you are sitting up straight. Do that throughout your prayer.”

(Narrated by al-Bukhaari, 724; Muslim, 397)

Not doing rukoo’ and sujood properly and completely is something which INVALIDATES ONE'S PRAYER.

It was reported that Abu Mas’ood al-Ansaari al-Badri said :
“The Messenger of Allaah (peace and blessings of Allaah be upon him) said :

‘A prayer in which a person does not straighten his spine in his rukoo’ and sujood does not count.”

[Narrated by al-Tirmidhi, 265; he said it is hasan saheeh.
Also narrated by al-Nasaa’i, 1027; Abu Dawood, 855;
Ibn Maajah, 870]