The Third Opinion
Another group of scholars were of the opinion that the ahadith mentioned in the beginning of this treatise were all general and that they found specification in other texts such as, “Whoever says, ‘None has the right to be worshipped save Allah,’ ‘sincerely…’, ‘…with certainty…’, ‘…with his heart affirming the truth of what his tongue articulates…’, ‘…saying it from his heart…’, and ‘…stated by his tongue with his heart finding tranquility in it…’
All of these texts show that the heart must have a role to play in this and it must articulate, and live, the meaning of the two testifications of faith. Its actualisation lies in the fact that the heart does not take a god besides Him by way of love, fear hope, reliance, seeking help, submission, penitence, and request. It actualises the fact that Muhammad is the Messenger of Allah by only worshipping Allah in the way legalised by him, may Allah’s peace and blessing be upon him.
This meaning was clearly mentioned by the Prophet, peace and blessing of Allah be upon him, in a hadith,
“Whoever says, ‘None has the right to be worshipped save Allah,’ sincerely shall enter Paradise.” (Bazaar on the authority of Abu Said)
He was asked, ‘Messenger of Allah, what does sincerity mean? He replied,
“That it prevent you from committing that which Allah has prohibited you from.”
This is reported on the authority of Anas ibn Malik and Zayd ibn al-Aqram but the isnads to both are not authentic, although Ahmad (no.12824) records one with smaller wording on the authority of Anas.
The Key To Paradise by Ibn Rajab Al-Hanbali Page 38