Respect religious beliefs other than Islam; Avoid idolatry; Not associate anyone else with God; Focus on worshipping God alone

This hadith is narrated by 'Aisha and it speaks about a church which she saw in Ethiopia. She told Allah's Messenger about it and he warned her that if any righteous pious man dies amongst them they would build a place of worship at his grave and make pictures in it. He said that these are the worst creatures in the sight of Allah. This hadith teaches us that we should not build places for worship around graves or make pictures inside them as this is considered to be one of the worst creatures according to Allah. We should instead focus on worshipping Him alone without associating anyone else with Him or His creation.