✅Answer:

Please pay attention to the following narrations:

1 Hammad ibn 'Isa narrates in the description of the prayer of Imam al-Sadiq (peace be upon him):

ثُمَّ اسْتَوَى قَائِماً فَلَمَّا اسْتَمْكَنَ مِنَ الْقِيَامِ قَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ- ثُمَّ كَبَّرَ وَ هُوَ قَائِمٌ وَ رَفَعَ يَدَيْهِ حِيَالَ وَجْهِهِ وَ سَجَدَ

Then the Imam (after saying the words of ruku') stood straight, and when he was settled in his standing (i.e., he was completely straight), he said:

سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ

Then, while still in the standing position, he said 'Allahu Akbar' and raised his hands to the level of his face and went into prostration....

📚 Al-Faqih, vol. 1, p. 300

2 عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اللَّهِ قَالَ: إِذَا قُمْتَ مِنَ السُّجُودِ قُلْتَ اللَّهُمَّ رَبِّي بِحَوْلِكَ وَ قُوَّتِكَ أَقُومُ وَ أَقْعُدُ- وَ إِنْ شِئْتَ قُلْتَ وَ أَرْكَعُ وَ أَسْجُدُ.

📚 Al-Tahdhib, vol. 2, p. 86

Imam al-Sadiq (peace be upon him) said: When you rise from prostration, say:

اللَّهُمَّ رَبِّي بِحَوْلِكَ وَ قُوَّتِكَ أَقُومُ وَ أَقْعُدُ

And if you wish, say (in continuation):

وَ أَرْكَعُ وَ أَسْجُدُ

3 عَنْ حَمَّادٍ عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي عَبْدِ اللَّه قَالَ: إِذَا قَامَ الرَّجُلُ مِنَ السُّجُودِ قَالَ بِحَوْلِ اللَّهِ أَقُومُ وَ أَقْعُدُ.

📚 Al-Tahdhib, vol. 2, p. 87

Imam al-Sadiq (peace be upon him) said: When a person rises from prostration, he says:

بِحَوْلِ اللَّهِ أَقُومُ وَ أَقْعُدُ

4 عَنْ حَمَّادِ بْنِ عِيسَى عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي عَبْدِ اللَّه قَالَ: إِذَا جَلَسْتَ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ فَتَشَهَّدْتَ ثُمَّ قُمْتَ فَقُلْ بِحَوْلِ اللَّهِ وَ قُوَّتِهِ أَقُومُ وَ أَقْعُدُ.

📚 Al-Tahdhib, vol. 2, p. 88

Imam al-Sadiq (peace be upon him) said: When you sit at the end of two rak'ahs and recite the tashahhud, and then you rise, say:

بِحَوْلِ اللَّهِ وَ قُوَّتِهِ أَقُومُ وَ أَقْعُدُ

5 عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اللَّه قَالَ: إِذَا قُمْتَ مِنَ السُّجُودِ قُلْتَ اللَّهُمَّ بِحَوْلِكَ وَ قُوَّتِكَ أَقُومُ وَ أَقْعُدُ وَ أَرْكَعُ وَ أَسْجُدُ.

📚 Al-Sara'ir, p. 484

Imam al-Sadiq (peace be upon him) said: When you rise from prostration, say:

اللَّهُمَّ بِحَوْلِكَ وَ قُوَّتِكَ أَقُومُ وَ أَقْعُدُ وَ أَرْكَعُ وَ أَسْجُدُ

6 عَنْ فَضَالَةَ عَنْ سَيْفٍ عَنْ أَبِي بَكْرٍ الْحَضْرَمِيِّ قَالَ: قَالَ أَبُو عَبْدِ اللَّهِ إِذَا قُمْتَ مِنَ الرَّكْعَتَيْنِ الْأَوَّلَتَيْنِ فَاعْتَمِدْ عَلَى كَفَّيْكَ وَ قُلْ بِحَوْلِ اللَّهِ أَقُومُ وَ أَقْعُدُ- فَإِنَّ عَلِيّاً كَانَ يَفْعَلُ ذَلِكَ.

📚 Al-Tahdhib, vol. 2, p. 89

Imam al-Sadiq (peace be upon him) said: When you rise from the first two rak'ahs, lean on your palms and say (while rising):

بِحَوْلِ اللَّهِ أَقُومُ وَ أَقْعُدُ

For indeed Ali (peace be upon him) used to do this.

✅ From the above narrations and others, it is clear that 'Sami'a Allahu liman hamidah' is said while standing after ruku' and while still, and then while still in the standing position, 'Allahu Akbar' is said, and then the person goes into prostration. But the phrase 'bi hawli Allahi wa quwwatihi aqumu wa aq'ud' and the like are said while rising.

اللَّهُمَّ فَصَلِّ عَلَی مُحَمَّدٍ وَ آلِ مُحَمَّدٍ وَ عَجِّلْ لِوَلِیِّکَ الْفَرَجَ وَ الْعَافِیَةَ وَ النَّصْرَ

The Etiquette of Prayer