Clarification that worship is not valid except with two conditions: sincerity and following the Prophet.

The Shaykh : And let it be known that worship is not valid except with two conditions: sincerity to Allah and following the Messenger of Allah (peace and blessings be upon him). As has been mentioned to us repeatedly, therefore, if one innovates a form of worship that Allah has not prescribed, even if his heart softens toward it and finds peace in it, but it has not been prescribed, it will not be accepted from him, due to the saying of the Prophet (peace and blessings be upon him): .