Rehras Sahib

One of the Shabads read daily in Rehras Sahib.

There are 5 So Dar Shabads, whilst there are 4 So Purakh Shabads.

Out of 5984 Shabads in Sri Guru Granth Sahib Ji, why did Guru Gobind Singh Ji choose these 9 Shabads to form the base of Rehras Sahib?

Is there any larhi, flow to the 5 So Dar and 4 So Purakh Shabads?

So Dar and So Purakh have no rahao to them. As you look at the rahaos to the other Shabads, you will get your answer.

Question posed by Bhai Manjeet Singh Ji