✅ Answer: Pay attention to the following narrations:

1⃣عَنِ الْحَلَبِیِّ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ کُلُّ مَا ذَکَرْتَ اللَّهَ عَزَّ وَ جَلَّ بِهِ وَ النَّبِیَّ فَهُوَ مِنَ الصَّلَاةِ الْحَدِیثَ.

📚 Al-Kafi, vol. 3, p. 337

Imam Sadiq (peace be upon him) said: Whatever you mention Allah the Exalted and Glorious and His Messenger with, it is considered part of the prayer!

2⃣قَالَ الصَّادِقُ کُلُّ مَا نَاجَیْتَ بِهِ رَبَّکَ

فِی الصَّلَاةِ فَلَیْسَ بِکَلَامٍ.

📚 Al-Faqih, vol. 1, p. 317

Imam Sadiq (peace be upon him) said: Whatever you use to supplicate to your Lord during prayer is not considered as speech (which invalidates the prayer)!

3⃣عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِیِّ بْنِ مَهْزِیَارَ قَالَ: سَأَلْتُ أَبَا جَعْفَرٍ عَنِ الرَّجُلِ یَتَکَلَّمُ فِی صَلَاةِ الْفَرِیضَةِ بِکُلِّ شَیْءٍ یُنَاجِی رَبَّهُ عَزَّ وَ جَلَّ قَالَ نَعَمْ.

📚 Al-Tahdhib, vol. 2, p. 326

Ahmad ibn Muhammad said: I asked Imam Jawad (peace be upon him) about someone who speaks anything to supplicate to his Lord during his prayer; the Imam said: Yes!

✅ According to the above narrations and others, words that are divine remembrance do not invalidate the prayer. Therefore, if someone says 'Shukran Lillah' (Thanks to Allah) in their prostration during prayer, whether by mistake or even intentionally, it does not cause any issue with the prayer, and there is no need for repetition or prostration of forgetfulness.

اللَّهُمَّ صَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْر

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