ANSWER: It was mentioned a lot in Quran and Sunnah but we don’t have any specific preference for it or any significance. 

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ANSWER: Fard is mandatory such as the 5 daily prayers.  Sunnah is the voluntary preferred acts such as the voluntary sunnah prayers. Mobah is permissible such as drinking water. https://islamqa.info/en/answers/149492/is-there-a-difference-between-naafil-sunnah-mandoob-and-mustahabb

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ANSWER: No need to react with anything as it has no significance. Others claim to have seen the name of Jesus on such things. Do we say that this has any significance? 

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