Knowledge is an obligation upon every male and female so seek sound knowledge.

The Islamic Creed Course – Fundamental Islamic Studies

The correctness of ‘Aqeedah is the (most) fundamental principle. This is because bearing witness that there is no deity worthy of worship except Allaah and that Muhammad is His Messenger, is the first pillar of Islaam.

And the Messengers called firstly, to the correction of the ‘Aqeedah because all acts of worship and behavior depend on it, and without the correct ‘Aqeedah, there is no benefit from (these) deeds.

The Most High said:
“But if they had joined in worship others with Allaah, all that they used to do would have been of no benefit to them.” [Al-An’am : 88]