ANSWER:

This is authentic and it is referring to hypocrites. 

Sir, is hadith authentic saying, “Allah will make their deeds dust on the day of judgement becoz they didn’t fear Allah when they were alone at night but did mountains of good deeds in day”

Sins | September 29, 2020 4:55 am
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The Messenger of Allah (blessings and peace of Allah be upon him) said to us: “O young men, whoever among you can afford it, let him get married, for it is more effective in lowering the gaze and guarding one’s chastity. And whoever cannot afford it should fast, for it will be a shield for him.” Sheikh according to this hadees can single man fast whole days or 15 days
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I see people committing SHIRK i dont tell them is it that i also committed shirk if i dont tell them. Is it compulsory in islam to advice or tell others. People commit many sins infornt of me do i need to advice or tell each one of them everytime.