Hadhrat Shaikhul Hadith Maulana Muhammed Zakariyyah (rahmatullah alayh) states:
“When one looks upon such people (who shave) then this thought comes to mind that death does not have stipulated time. And if such people have to die whilst in this shaven state, then how will they ever be able to face the blessed countenance of Nabi (sallAllaahu alaihi wasallam), when the first sight of him will be in the grave.
Together with this, occasionally this thought also comes to mind that other major sins like adultery, homosexuality, alcoholism, dealing in interest, etc. are all restricted to a specified time. Nabi (sallAllaahu alaihi wasallam) said: “An adulterer does not commit adultery whilst in the state of Imaan.” The Mashaaikh have written that the object of this Hadith is that during the course of the act of adultery, the Imaan of the adulterer leaves him/her. But after the act is complete, then the Noor of the Imaan returns to one. But, the sin of shaving is such that it remains with one all the time. Whilst performing Salaat then this sin is being perpetrated, whilst in the state of fasting, this sin is with one, the same applies to Hajj. This sin is being perpetrated whilst performing every act of Ibaadat.”
[“The Compulsion of the Beard”, page 4]