There is very old proverb in Punjabi language which justifies the unity of Kamboj community:
ਜੱਟ ਮੈਂਹਾਂ, ਸੰਸਾਰ, ਕਬੀਲਾ ਗਾਲਦੇ।
Kukaṛa, kāṁ, kabō'a kabīlā pāladē,
jaṭa mainhāṁ, sasāra, kabīlā gāladē
The well-known saying ‘Kukar Kaan Kamboh Kabila Palde’ had indeed become vogue as a consequence to Shahbaaz Khaan Kamboh’s over-generosity towards his ethnical kins from Kamboja tribe.
Shahbaaz Khan Kamboh was one of the finest general of Emperor Akbar. Abu Fazal states that Shahbaaz Khan Kamboh was an excellent general, faithful officer but he also accuses him of fanaticism. In matter of magnanimity and generosity he had no equals, and his colleague generals were jealous that he has a parse or a touchstone in his possession. His army division was always found in the best possible condition. He owned an excellent fleet of 10,000 horsemen which was made up entirely of the Kamboja soldiers. The total annual pay for his unit was over Rs 30,00000.00 in those good old days. He was the best friend of the Kambojs of whatever religion they came from and had helped them to the best of his capacity. It is stated in the Ain-a-Akbari that he helped and gave so much to the Kambohs that not even a single Kamboj was in a bad economic condition in those days. (Aina-a-Akbari by Abu-Fazal Alami Trans by H. Blochman, 1965, Second Edition). So due to this generosity about his Kamboj tribe, this proverb become famous that Kamboj people always helps each other and remain united.
Here is link to the YouTube video where famous Punjabi singer Daljit Kaur explained the meaning of this proverb in detail: https://www.youtube.com/watch?v=2Y_9gBoD1JU
Abu'l-Fazl ibn Mubarak, also known as Abul Fazl, Abu'l Fadl and Abu'l-Fadl 'Allami (14 January 1551 – 22 August 1602), was the grand vizier of the Mughal emperor Akbar, and author of the Akbarnama, the official history of Akbar's reign in three volumes, (the third volume is known as the Ain-i-Akbari) and a Persian translation of the Bible. He was also one of the Nine Jewels (Hindi: Navaratnas) of Akbar's royal court and the brother of Faizi, the poet laureate of Emperor Akbar.