Is what was said to the person working in a pharmacy without a license to practice correct from a Sharia perspective, and what is the ruling on the money he earns from this work, taking into account the Hadith: "Whoever interprets the Quran according to his own opinion has erred, even if he is correct," and Sheikh Al-Islam Ibn Taymiyyah's analogy based on it?

If your relative's work in the pharmacy is limited to handing over medicines prescribed in medical prescriptions and similar tasks that do not require specialization or a license, then there is no objection to it. However, actually practicing the profession of a pharmacist by an unqualified person is a dangerous and forbidden act, and his wages from it are unlawful, as the Prophet, peace and blessings be upon him, said: "Indeed, when Allah forbids something to a people, He also forbids its price to them." The jurists have stipulated that an unskilled physician does not deserve payment for his work. This differs from speaking about the Qur'an with an opinion concerning error in Allah's words and the rulings of His religion, which is speaking about Allah without knowledge.