The testimony of Tawhid is a matter of great virtue, by means of which a person enters Islam and exits disbelief, and by virtue of it he will be saved on the Day of Resurrection from abiding forever in the Fire. In this hadith, Anas (may Allah be pleased with him) narrates something that the Prophet (blessings and peace of Allah be upon him) told Mu‘adh ibn Jabal (may Allah be pleased with him), when he was riding behind the Prophet (blessings and peace of Allah be upon him) on his mount. The Prophet (blessings and peace of Allah be upon him) called out to Mu‘adh, repeating the call three times, to highlight the importance of what he was going to tell him. Each time, Mu‘adh (may Allah be pleased with him) responded by saying: Labbayka ya Rasulallah wa sa‘dayk (Here I am at your service, O Messenger of Allah). In other words, I respond to you, O Messenger of Allah, time after time; or, I am adhering to obedience to you time after time, seeking bliss and well-being in this world and the hereafter each time I respond to you. This means that he was responding to the Messenger of Allah (blessings and peace of Allah be upon him) and affirming his willingness to obey him in whatever instructions he gave him. As Mu‘adh (may Allah be pleased with him) responded well and listened attentively, the Prophet (blessings and peace of Allah be upon him) told him that there is no one who testifies that none has the right to be worshipped but Allah, so none is worshipped rightfully except Him, and that Muhammad is the Messenger of Allah, sincerely from the heart, but Allah will forbid him to the Fire, meaning that He will forbid him to abide therein forever. The phrase “sincerely from the heart” means that what matters is that saying and uttering the twin declaration of faith (al-shahadatayn) should be based on what one believes in the heart. This is by way of excluding the hypocrite, because the words of the twin declaration of faith will not benefit the hypocrite on the Day of Resurrection, for he did not say these words sincerely from the heart. Mu‘adh (may Allah be pleased with him) asked the Prophet (blessings and peace of Allah be upon him) to let him tell the people about this, so that they would rejoice and be of good cheer, but the Prophet (blessings and peace of Allah be upon him) was concerned lest the people rely on it, and therefore strive less and do fewer acts of worship. So Mu‘adh did not narrate it to anyone until just before he died, for fear of falling into the sin of withholding knowledge. It was said that the apparent meaning of the report indicates that all those who utter the twin declaration of faith will not enter the Fire, because of the general and emphatic meaning of the hadith, but the definitive proof of Ahl al-Sunnah indicates that a group of believers who sinned will be punished in the Fire for the sins that they committed, then they will be brought forth from the fire through intercession. This hadith gives great glad tidings to those who affirm the oneness of Allah that if the one who committed major sins dies affirming the oneness of Allah, he will not abide in the Fire forever. It also indicates that there are some types of knowledge that may be told to all people, and some types that may be given only to the elite. It highlights the humbleness of the Prophet (blessings and peace of Allah be upon him). It highlights the high status of Mu‘adh ibn Jabal (may Allah be pleased with him) in terms of knowledge, because the Prophet (blessings and peace of Allah be upon him) told some knowledge exclusively to him. It indicates that words may be repeated for a purpose and to make a point. It indicates that one may respond by saying, Labbayka wa sa‘dayk (here I am at your service)..