It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that he said: "In prayer, the Prophet (peace and blessings be upon him) would perform the bowing (ruku') and prostration (sujud) completely, but would keep the standing and the sitting light."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Zayd bin Aslam (may Allah have mercy on him) except Hashim bin Abi Hurayrah (may Allah have mercy on him), and Sulayman bin Abd al-Rahman (may Allah have mercy on him) is alone in narrating it from him."