What is Sajda Sahw?
It is narrated by Sayyidina Abdullah ibn Ja'far (RA) that the Prophet (Sallallaho Alaihe Wassallam) said: “Anyone who has doubt in his prayer should make Sajda Sahu after giving the salutation.” Sahu means forgetfulness.
If you unintentionally commit a mistake in Waajib of Salah then you can rectify this mistake by performing Sajda Sahw. If you commit a mistake which is not included in Wajib acts of the prayer then, just seek forgiveness from Allah.
There is no need to perform forgetfulness prostration (Sajda Sahu). Your prayers will Insha'Allah be valid and no rectification will be needed.
When is Sajda Sahw necessary?
1-If one or many of the wajib acts of Salah is omitted unintentionally then it becomes wajib to make the Sajda Sahw. By performing the Sajda e Sahu, the prayer becomes valid. If one does not perform it, he has to repeat the prayer. Recommended: 14 Wajib Acts during Salah omission of which requires Sajda Sahu
2-If one forgetfully leaves an act which is obligatory and a fardh act of prayer, then prayer will not become valid by performing the Sajda Sahw. One must repeat it. Recommended: 6 Fard Acts during Salah omission of which invalidates the Salah
3-The Sajda e Sahw becomes wajib if a person does any mistake unintentionally. But if a person intentionally omits anything and done those mistakes, he has to repeat his prayer. Even if doing the Sajda Sahu doesn’t make any difference, the prayer will still be invalid
How to do sajda Sahu?
We have already explained in a separate article how to do Sajda Sahu in a Salah.
14 mistakes in Salah which do not require Sajda Sahu
1-When a person starts his prayer by reciting dua-e-qunoot rather than reciting the thanaa, the forgetfulness prostration Sajda Sahw won’t become wajib.
2-Likewise, if a person in the 3rd and 4th unit of a Fardh prayer is recited at-tahiyyaat or anything else in place of Surah Faatihah, the Sajda e Sahu won’t be wajib.
3-A person forgets to sit in the second rakaat for the At-Tahiyaat in a 3 or 4 rakaat prayers and stands up directly for the 3rd rakaat. However, if he has not completely stood up and nearer to the sitting posture, and he remembers that he was supposed to sit for At-tahiyaat, he should sit down to recite the at-tahiyyaat and after that offer his remaining prayer and there is no need of the Sajda Sahw.
4-If a person forgets about the number of rakaat and instead of sitting down in the 4th rakaat he almost stands up, then if he is still in the sitting posture, like not standing properly, he has to sit down, recite the at-tahiyyaat, darood, dua and then in the end salaam. The Sajda Sahu does not become Waajib.
5-However, it is important to mention here that if a person does not realize even in his 5th rakat that he is praying actually fifth rakat till the time he performs Sajda, he will have to complete one more rakat and complete 6 rakat. This 2 additional rakat will be considered as a nafl prayer. There will be no Sajda e Sahw.
6-In the case of confusion between the numbers of rakaats he has to repeat his prayer if this confusion was coincidental. But if these sorts of uncertainties happen rather frequently, he should see what his heart felt and contemplate on his heart and go with it. The Sajda Sahu won’t be wajib. If a person has a doubt about a number of rakaats after completing prayer, then he should not bother about this doubt, his prayer is valid.
7-The Sajda Sahws (sujood) will not become wajib if a person read thanaa’ instead of reciting dua-e-qunoot in the witr prayer and later on when he knew his mistake, he recited the qunoot as well.
8-If in a prayer, a person recites more than one surah after reciting Surah Faatihah, than it does not invalidate your prayer and no need of the Sajda Sahu.
9-If by mistake a person recites any Surat other after Surah Faatihah in last two rakasts of a fard prayer, then the Sajda Sahw won’t be wajib.
10-If upon commencing the prayer a person forgets to recite the thanaa', the Sajda e Sahu won’t be wajib
11-If he forgets to recite ruku tasbeeh, the Sajda Sahw won’t be wajib
12-If he forgets to recite prostration tasbeeh, the Sajda Sahu won’t be wajib
13-While concluding his prayer he makes salaam without reciting the dua and durood, the Sajda e Sahw won’t be wajib
14-If a person stands silently in the third and fourth rakaat of a fardh prayer and does not recite Surah Faatihah even, then the Sajda e Sahu won’t be wajib. It is Sunnah to recite Surat Fatiha in 3rd and 4th rakat of a fardh prayer
Source: Central Mosque