Attempting to Safeguard Oneself from Showing Off (Ar-Riyaa) – Al-Uthaymīn
There are those who abandon acts of obedience [due to] fear of riyaa [i.e. showing off in acts of worship].
This [occurs] because Shaytān plays about with a person and beautifies for him [or her] the abandonment of acts of obedience out of fearing riyaa; rather you should perform acts of obedience, but there should not be -in your heart- [a desire] to show off.
Al-Qawl al-Mufīd fī Sharh Kitāb at-Tawhīd by Shaykh Uthaymīn, Vol.1 Pg.92