Raise your hands while making a supplication/invocation to show respect towards Allah SWT .

The hadith narrated by Anas bin Malik speaks about the importance of raising one's hands when making a supplication or invocation. This is especially true when making an invocation for rain, known as Istisqa'. It is reported that the Prophet Muhammad ﷺ would lift his hands so high that the whiteness of his armpits could be seen. This shows how important it was to him to make this supplication with sincerity and humility. It also serves as an example for us on how we should approach our own invocations and supplications - with utmost sincerity and humility, lifting our hands up towards Allah in prayer.