Ibn Qayyim رحمه الله stated:
"The Prophet (ﷺ) gathered all aspects of piety in one statement. He (ﷺ) said:
'From the goodness of one's Islām is that he leaves alone that which doesn't concern him.'
This entails leaving off that which doesn't concern (the person)
from speech,
the things one looks at,
the things one listens to,
the things one touches,
the things one walks towards,
the thoughts (of the mind) and
the rest of the outward and inward movements.
This statement (of the Prophet) is remedial and sufficient (being all-inclusive) regarding the (aspects) of piety."
(Madārij As-Sālikīn 2/21)