What do you mean by Raj karega khalsa aki reheh na koi ------ who is going to raj?

"Raj Karega Khalsa, Aaki Reheh Na Koi" often attributed to Guru Gobind Singh, means that the Khalsa (the Sikh community) will rule and no one will be able to oppose them. It is a statement of the inherent strength and power of the Khalsa and reflects the Sikh belief in self-determination and sovereignty.