Raise your arms parallel with your shoulders when starting or ending prayers.

The hadith narrated by Ali bin Abu Talib explains the importance of raising one's hands when beginning and ending prayer. This is a sign of humility and submission to Allah, as it shows that we are asking for His mercy and guidance. When starting prayer, Muslims should raise their hands up to their shoulders while saying "Allahu Akbar" which means "God is Great". Similarly, when bowing down in sujood or prostrating, they should raise their hands up again before going into position. Finally, after completing two prostrations they should again raise their hands up to shoulder level before standing back up. This act of raising one's hand during prayer is an important part of Islamic worship as it symbolizes our reliance on Allah for all things.