At-Taḥiyyāt — the tashahhud
Sitting in prayer
التَّحِيَّاتُ لِلَّهِ وَالصَّلَوَاتُ وَالطَّيِّبَاتُ، السَّلاَمُ عَلَيْكَ أَيُّهَا النَّبِيُّ وَرَحْمَةُ اللَّهِ وَبَرَكَاتُهُ، السَّلاَمُ عَلَيْنَا وَعَلَىٰ عِبَادِ اللَّهِ الصَّالِحِينَ، أَشْهَدُ أَنْ لاَ إِلَٰهَ إِلاَّ اللَّهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ
At-taḥiyyātu lillāhi wa aṣ-ṣalawātu wa aṭ-ṭayyibāt. As-salāmu ʿalayka ayyuhā an-nabiyyu wa raḥmatu Allāhi wa barakātuh. As-salāmu ʿalaynā wa ʿalā ʿibādi Allāhi aṣ-ṣāliḥīn. Ash-hadu an lā ilāha illā Allāh, wa ash-hadu anna Muḥammadan ʿabduhu wa rasūluh.
"All greetings, prayers, and pure words are for Allah. Peace be upon you, O Prophet, and the mercy of Allah and His blessings. Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no god but Allah, and I bear witness that Muhammad is His servant and messenger."
Source: Ṣaḥīḥ al-Bukhārī 831
Where the scholars teach this duʿāʾ.
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"PROHIBITIONS The Messenger of Allah, peace and blessings be upon him, forbade continuous sitting in prayer, clasping hands behind the back, squatting, leaving the hands loose, keeping arms too close, bowing with arms flat like a dog's spread posture, praying while pressing the bladder, bowels, or hunger, or in anger, and covering the face."
— Imam al-Ghazali, Book 4: The Book of Prayer
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"Ali, may Allah be pleased with him, said, "Whoever reads the Qur'an while standing in prayer earns a hundred good deeds for each letter. Whoever reads it while sitting in prayer earns fifty good deeds for each letter. Whoever reads it outside of prayer while in a state of ablution earns twenty-five good deeds for each letter."
— Imam al-Ghazali, Book 8: The Mysteries of Qur'an Recitation