What distinguishes the Torah from the Gospel, and the Holy Qur’an from the Tadhkira?
The Gospel brought no new law. It followed the Torah and confirmed it. In the same way, the Tadhkira contains revelations to Hazrat Mirza Ghulam Ahmad (as), the Promised Messiah, which follow the Holy Qur’an, never contradict it, and neither add anything to it nor take anything away.
Moses (as) received the Torah, a book of law, guidance and light. After him, God sent many prophets to the Children of Israel. They brought no new law. Instead they judged by the Torah, as the first verse above shows. Jesus (as) was one of them.
So what is the Gospel? It is the revelation God gave to Jesus (as). It too contained guidance and light. But it did not set itself against the Torah. It confirmed it and called people back to its spirit. The difference, then, is not a new law but a different task. The Torah is the book of law, and the Gospel is a revelation in the service of that law.
The same is true of the Holy Qur’an and the Tadhkira. The Holy Qur’an is the book that contains the complete law. Yet God has not stopped speaking to people He chooses. The Tadhkira is a collection of the revelations received by Hazrat Mirza Ghulam Ahmad (as), the Promised Messiah, who came in the spirit and likeness of Jesus (as).
None of these revelations contradicts a single verse of the Holy Qur’an. None adds anything to it, and none takes anything away. All of them remain within its teaching. That is why the Tadhkira is not a second book of law alongside the Holy Qur’an.
Put simply, just as the Gospel followed the Torah, the Tadhkira follows the Holy Qur’an. In both cases God speaks to a messenger who serves the book before him and does not replace it.