Is the prayer of one who does not recite the words in the Ibrahamic prayer with a tanween, and makes the yaa’ of (النبي) silent in "Peace be upon you, O Prophet," and pronounces the haa’ of (الله) with a fat-ha or kasra in "and the mercy of Allah and His blessings," and makes the haa’ of (وبركاته) silent or pronounces it with a damma, and pronounces the taa’ of the same word with a kasra; valid? And does making the last word in the Tashahhud silent or pronouncing it with a damma follow the same rules of stopping (waqf) in Tajweed of the Qur’an? And is the salutation to exit the prayer "Peace be upon you" or "The Peace be upon you"?

The hidden melodic error (Lahn Khafi) that does not alter the meaning does not invalidate the prayer. When pausing, the end of words are rendered silent (sakin), such as "At-Tahiyyatulillah" (All greetings are for Allah) and "Wa as-Salawatu wat-tayyibat" (and all prayers and good things). When continuing, the end of words are vocalized according to their grammatical position, such as "Lillahi" with a kasra (vowel sound 'i'). The word "An-Nabiyyu" is pronounced with a shaddah (doubled consonant) on the Ya and a Damma (vowel sound 'u'). "Rahmatullahu" has a kasra on the Ha. "Barakatuhu" has a Damma on the Ta, and the Ha is silent when pausing and has a Damma when continuing. "Allahumma Salli 'ala Muhammadin" is tanweened with a kasra when continuing. It is not obligatory to adhere to the rules of Tajweed here, but rather to avoid melodic errors (Lahn) and altering the form of Arabic speech. As for the salutation, it is said "Assalamu alaykum wa rahmatullah" (Peace be upon you and the mercy of Allah) to the right and left, with the definite article "Al" for "Salam."