Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates: In supplication the Prophet (peace and blessings be upon him) would raise both hands so high that the whiteness of his armpits could be seen.
Al-Bazzar recorded it from his teacher Muhammad bin Yazid, and I do not know him; the remaining narrators of this report are 'thiqat' (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدعية / 17337