Allah, the Exalted, has said:

They had only been commanded to worship Allah, devoting themselves wholly to Him in full sincerity, and to observe Prayer and to pay the Zakat. This is the enduring faith (98.6).

Their flesh reaches not Allah, nor their blood, but it is your righteousness that reaches Him (22.37).

Warn them, O Prophet: Whether you keep hidden that which is in your minds, or disclose it, Allah knows it well (3.30).