Some benefits from Sharh us’Sunnah:

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•Imām al-Barbahaaree رحمه الله:

“Know that this world is an abode of Imān and Islām. And the followers of Muhammad ﷺ in it are believers and Muslims in their rulings, their inheritance, slaughtering (i.e sacrificial animal) and funeral prayer on them.  Do not testify for anyone as having true Imān until he performs  all the rites of Islām. If he falls short in anything of them, he is regarded as one having imperfect faith till he repents. And know that the knowledge of his Īmān is with Allāh عزوجل whether complete Īmān or incomplete; except what is apparent to you of negligence of the laws of Islām.”

[شرح السنه, p.273]

•Nifāq (Hypocrisy)

Shaykh al-Fawzān حفظه الله:

“If he prays in the presence of people, he beautifies his Salah; but if he prays in his house or in a hidden place, he hastily performs the Salah without even paying attention. This was what the companions severely  feared for themselves. No one should free himself from it. So a person should be afraid of it. That is why they said:

“None fears it except a believer and none considers himself free from it except a hypocrite.”

[شرح السنه,p.270]

••Imām al-Barbahāree رحمه الله:

“Nifāq (hypocrisy) is to manifest Islām on the tongue while concealing Kufr (disbelief) in the heart.”

[شرح السنه,p.267]

•Nifāq I’tiqādī (hypocrisy in belief):

“This is a major disbelief. A hypocrite is worse than the original disbeliever. This is because the original disbeliever is well-known as a disbeliever and as an enemy. But a hypocrite deceives Muslims and displays that he is one of them
whereas he is an enemy to them. He displays that he is a Muslim whereas he is a disbeliever…”

[شرح السنه, p.267]

•An-Nifāq al-‘Amalī (hypocrisy in deeds):

“It is for a person to be a believer inwardly and outwardly; but such person displays some attributes of the hypocrites. These attributes decreases his Īmān and there is a severe threat upon him. But he is not out of fold of Islām. It is called an-nifāq al-‘Amalī and also called an-Nifāq al-Asghar (minor hypocrisy)…”

[شرح السنه, p.268]