"[The Singhs would] engage in endless military exercises" - Naveen Panth Prakash [1880]

[Gyani Gyan Singh describing the warriors of Guru Gobind Singh]

ਸੁੱਖਾ ਫੀਮ ਸ਼ਰਾਬ ਕਬਾਬੈਂ ਛਕੈਂ ਜਿਤਿਕ ਮਨ ਭਾਵੈ ।

[The Singhs would] consume marijuana, opium, alcohol and kebab's to their hearts delight.

ਖੇਲੈ ਨਿੱਤ ਸ਼ਿਕਾਰ ਬਨਨ ਮੈਂ ਮਾਰਿ ਮ੍ਰਿਗ ਬਹੁ ਖਾਵੈਂ ।

They would constantly be engaged hunting in the forest, consuming and killing many deer.

ਘੋੜਨ ਪਰ ਅਸਵਾਰ ਹੋਇ ਕਰਿ ਸਜ ਕੈ ਸ਼ਸਤ੍ਰ ਸਾਰੇ ।

Riding atop horses, [the Singhs] adorn themselves fully with weapons.

ਭਾਂਤਿ ਭਾਂਤਿ ਕੀ ਪਹਿਨ ਪੁਸ਼ਾਕਾਂ ਕਰੈ ਕੁਵੈਦ ਅਪਾਰੇ ।

In many different ways [they] adorn the dress [of a warrior], and engage in endless military exercises.

Naveen Panth Prakash, Poorabaradh Bisraam 62, verse 91.

This passage is from Naveen Panth Prakash [1880 CE], written by Gyani Gyan Singh Nirmala. Gyani Ji's works are well cemented in Sikh historical literature, with his words being recited daily during the Ardaas. The poetic, ਸਭ ਸਿਖਨ ਕੋ ਹੁਕਮ ਹੈ ਗੁਰੂ ਮਾਨਿਯੋ ਗ੍ਰੰਥ, finds it origin in the Naveen Panth Prakash.