The tenth: composure (ṭumaʾnīnah)—that is, bodily stillness, even if brief, in every obligatory posture.

The eleventh: the final tashahhud, which begins with the invocation, "O Allah, send prayers upon Muhammad," after reciting the portion that suffices from the first tashahhud. The minimum acceptable wording is:
“All greetings belong to Allah. Peace be upon you, O Prophet, and the mercy of Allah1 and His blessings. Peace be upon us and upon Allah’s righteous servants. I bear witness that there is no god but Allah, and that Muhammad is the Messenger of Allah.”
The complete, well-known version is preferable.

The twelfth: sitting for this tashahhud and for the two salāms. If one recites the tashahhud while not seated, or delivers the first salām seated and the second while standing, the prayer is invalid.

The thirteenth: the two salāms, meaning to say twice: “Peace be upon you and the mercy of Allah.” It is preferable not to add “and His blessings.”2 One salām suffices in a voluntary prayer, and likewise in the funeral prayer.

The fourteenth: maintaining the sequence of pillars as described above.3 Thus, if someone were to prostrate before bowing deliberately, the prayer would be invalid; if done forgetfully, he must return, bow, and then prostrate.