There isn’t any mentioning of that in the Quran as there is no mentioning of the number of rakah of all five daily prayers or how to perform them!

Read more

Assalamu alaikum, It is not part of the sunnah to gargle. One must swirl the water around in his mouth.

Read more

Wa alaikum salaam, nothing in specific; just make niyyah to fast.

Read more