It is narrated from Abu Qilabah (may Allah have mercy on him): I saw Malik bin al-Huwayrith (may Allah be pleased with him) praying. He said the takbir and raised both hands, and when he intended to bow he also raised both hands, and also when raising his head from the bowing. And he told us that the Messenger of Allah (peace and blessings be upon him) also used to do the same.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2512