You seek refuge in Allah whenever you hear it. This is recommended but not mandatory.

Do I need to say “a’oodhu billaahi min al-shaytaan ir-rajeem” whenever I hear dog barking at night or should I just say it once.

Other | December 1, 2015 3:32 am
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I learnt from an online QA (Islamqa) site that clapping for e.g. a Halal performance, is Haram and they presented verse 35 of Sura Anfal as related reference. I wanted to know that, since this may be a worldly affair and not ibadat, is this Haram? Or Makruh? Please advise.
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Is it permissible if someone enters the mosque and the person in the mosque greets him by standing up.