In his ‘Last Testament’ Shah Wali Allah urged his followers to observe the customs of their Arabian ancestors: As a mark of gratitude for these bless… - Shah Waliullah Dehlawi

We are strangers. Our forefathers came to live in India from abroad. For us, Arab descent and the Arabic language are cause of pride, because these two bring us nearer to the Lord of First and the Last, the noblest of the Prophets and Apostles.

Then there are many people who are dominated by base inclinations, beastly morals, and the temptations of Satan ... and the customs of their forefa- thers cleave to their hearts, [such people] do not heed the benefi ts and do not obey that which the Prophet commanded and do not reflect upon the superiority [of what the Prophet commanded]; mercy for them is that belief should be forced upon them, despite themselves, like bitter medicine; there is no subjugating [them] save through killing him among them who is strongly prejudiced and stubbornly refuses, dispersing their power, and dis- possessing them of their property until they become unable to do anything, only then will their followers and their offspring willingly and obediently embrace the faith.

…There are three groups in Hindustan which are known for the qualities of fanaticism and zeal. So long as these three are not exterminated, no king can feel secure, nor any noble. The people (read Muslims) also will not be able to live in peace.
Religious as well as worldly interests dictate that soon after winning the war with the Marhatahs, you should turn towards the forts of the Jats, and conquer them with the blessings from the hidden (occult) world. Next is the turn of the Sikhs. This group should also be defeated, while waiting for grace from Allah.
…I appeal to you in the name of Allah and his Prophet that you should not cast your eye on the property of any Muslim. If you take care in this regard, there is hope that the doors of victory will be opened to you one after another. But if this caution is ignored, I fear that the wails of the oppressed may become obstacles in the way towards your goal.