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  

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  

[Machine] 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  

[Machine] 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  

[Machine] 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  

[Machine] 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»  

[Machine] 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»  

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»