Associating Partners with Allah

Verily, Allah forgives not that partners should be set up with him in worship, but He forgives except that (anything else) to whom He pleases, and whoever sets up partners with Allah in worship, he has indeed invented a tremendous sin.  4:48

Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills. And he who associates others with Allah has certainly gone far astray. 4:116

Indeed, he who associates others with Allah – Allah has forbidden him Paradise, and his refuge is the Fire. And there are not for the wrongdoers any helpers 5:72
The Prophet (saw), “Should I not inform you of that which I fear for you even more than the dangers of dajjaal? It is the hidden shirk: A person stands to pray and he beautifies his prayer because he sees the people looking at him”. (Sahih; Sunan ibn Majah)

Meaning:-
Astray: into error, away from the correct path or direction

Forbidden: refuse to allow (something), prohibit, not allowed, banned.
refuge:-: shelter, protection, safety, security, asylum,
Wrongdoer: a person who behaves illegally or dishonestly; an offender.