It is well known that the Final Tasha-hud is a pillar from the pillars of prayer; and in one of the prayers I did not complete except a little bit of the Tasha-hud, so should I repeat my prayer?
Answer:
It is upon you to complete the Tasha-hud, even if you missed some (of it whilst praying with) your Imaam (i.e. the one leading you in Salaah); because according to the most correct saying (or view) of the scholars the Final Tasha-hud is a pillar (of the prayer), and there is the Salutation upon the Prophet (sallal-laahu-alayhi-wasallam) in it. Therefore, it is obligatory to complete it even after the Imaam’s Salaam (i.e. after he finishes the prayer). And from it (i.e. the Tasha-hud) is seeking Allaah’s protection from the Hell fire, the punishment of the grave and from the trials of life and death, and from the trial of the Dajjaaj; because the Prophet (sallal-laahu-alayhi-wasallam) commanded with seeking (Allaah’s) protection from these four (things) in the Final Tasha-hud, and that is because some of the people of knowledge consider that to be an obligation.
”Verily, the Muttaqoon (pious) will be in the midst of Gardens and springs (in the Paradise), taking joy in the things which their Lord has given them. Verily, they were before this Muhsinoon (good-doers). They used to sleep but little by night [invoking their Lord (Allaah) and praying, with fear and hope]. And in the hours before dawn, they were (found) asking (Allaah) for forgiveness, And in their properties there was the right of the beggar, and the Mahroom (the poor who does not ask the others).” [51:15-19]