The narrator Anas added that the Prophet ﷺ raised his hands (during the invocation) to such an extent that the whiteness of his armpits was visible.

عَنِ النَّبِيِّ ﷺ أَنَّهُ رَفَعَ يَدَيْهِ حَتَّى رَأَيْتُ بَيَاضَ إِبْطَيْهِ

The Prophet ﷺ never raised his hands for any invocation except for that of Istisqa' and he used to raise them so much that the whiteness of his armpits became visible. (Note: It may be that Anas did not see the Prophet ﷺ raising his hands, but it is narrated that the Prophet ﷺ used to raise his hands for invocations other than Istisqa. See Hadith No. 807 & 808 and also see Hadith No. 612, Vol. 5).

كَانَ النَّبِيُّ ﷺ لاَ يَرْفَعُ يَدَيْهِ فِي شَىْءٍ مِنْ دُعَائِهِ إِلاَّ فِي الاِسْتِسْقَاءِ وَإِنَّهُ يَرْفَعُ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

Narrated Anas, "The Prophet ﷺ raised his hands (in invocation) till I saw the whiteness of his armpits."

عَنِ النَّبِيِّ ﷺ رَفَعَ يَدَيْهِ حَتَّى رَأَيْتُ بَيَاضَ إِبْطَيْهِ

I saw the Messenger of Allah ﷺ raising his hands (high enough) in supplication (for rain) that the whiteness of his armpits became visible.

رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَرْفَعُ يَدَيْهِ فِي الدُّعَاءِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

"The Messenger of Allah ﷺ did not raise his hands during any supplication except when praying for rain, when he used to raise his hands so high that the whiteness of his armpits could be seen." (Using translation from Nasāʾī 1513)

«كَانَ رَسُولُ اللَّهِ ﷺ لَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنَ الدُّعَاءِ إِلَّا فِي الِاسْتِسْقَاءِ»

[AI] I saw the Prophet ﷺ prostrating, his armpits were so close to the ground that the whiteness of his armpits could be seen.

رَأَيْتُ النَّبِيَّ ﷺ سَاجِدًا قَدْ خَوَّى حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

[AI] That the Prophet ﷺ raised his hands until the whiteness of his armpits could be seen.

أَنَّ النَّبِيَّ ﷺ رَفَعَ يَدَيْهِ حَتَّى رُئِيَ بَيَاضُ إِبِطَيْهِ

[AI] The Messenger of Allah ﷺ used to raise his hands in supplication until the white color of his armpits could be seen.

كَانَ رَسُولُ اللهِ ﷺ يَرْفَعُ يَدَيْهِ فِي الدُّعَاءِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

The Prophet (peace be upon him) was not accustomed to raise his hands in any supplication he made except when praying for rain. He would then raise them high enough so much so that the whiteness of his armpits was visible. (Using translation from Abū Dāʾūd 1170)

أَنَّ النَّبِيَّ ﷺ كَانَ لَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنَ الدُّعَاءِ إِلَّا عِنْدَ الِاسْتِسْقَاءِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

[AI] The Messenger of Allah ﷺ used to bow down in prostration until the whiteness of his armpits could be seen.

كَانَ رَسُولُ اللهِ ﷺ إِذَا سَجَدَ جَافَى حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ

[AI] The translation of the given Arabic sentence is: "The Prophet ﷺ used to raise his hands in supplication until the whiteness of his armpits was visible."

«كَانَ النَّبِيُّ ﷺ يَرْفَعُ يَدَيْهِ فِي الدُّعَاءِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ»

"The Messenger of Allah ﷺ did not raise his hands during any supplication except when praying for rain, when he used to raise his hands so high that the whiteness of his armpits could be seen." (Using translation from Nasāʾī 1513)

كَانَ رَسُولُ اللَّهِ ﷺ «لَا يَرْفَعُ يَدَيْهِ فِي شَيْءٍ مِنَ الدُّعَاءِ إِلَّا فِي الِاسْتِسْقَاءِ فَإِنَّهُ كَانَ يَرْفَعُ يَدَيْهِ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ»

[AI] "The Messenger of Allah, ﷺ , used to lower his forehead to the ground in prostration until the whiteness of his armpits was visible."

«كَانَ رَسُولُ اللهِ ﷺ إِذَا سَجَدَ جَافَى حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ»

[AI] I saw the Messenger of Allah ﷺ making a supplication and he raised his hands until I could see the whiteness of his armpits.

«رَأَيْتُ رَسُولَ اللهِ ﷺ دَعَا فَرَفَعَ يَدَيْهِ حَتَّى رَأَيْتُ بَيَاضَ إِبْطَيْهِ»

[AI] "That the Prophet ﷺ used to raise his hands when delivering a sermon until the whiteness of his armpits could be seen."

«أَنَّ النَّبِيَّ ﷺ كَانَ يَرْفَعُ يَدَيْهِ إِذَا خَطَبَ حَتَّى يُرَى بَيَاضُ إِبْطَيْهِ»

[AI] The Messenger of Allah ﷺ used to have his armpits visible when he prostrated.

كَانَ رَسُولُ اللهِ ﷺ «يُرَى بَيَاضُ إِبْطَيْهِ إِذَا سَجَدَ»

I saw the Messenger of Allah ﷺ raising his hands (high enough) in supplication (for rain) that the whiteness of his armpits became visible. (Using translation from Muslim 895a)

«كَانَ رَسُولُ اللهِ ﷺ يَرْفَعُ يَدَيْهِ فِي الدُّعَاءِ حَتَّى تُرَى إِبْطَاهُ»