What is the ruling on congregational supplication immediately after reciting the Qur’an, where one person supplicates and the rest say "Ameen," and is it sufficient to cite the verse: "And your Lord says, 'Call upon Me; I will respond to you'" (Ghafir/60) as evidence?

The fundamental principle regarding acts of worship is tawqif (restriction to what is legislated), meaning it is not permissible to commit to a specific manner, number, or time for an act of worship without evidence. It has not been authentically reported from the Prophet (peace be upon him) nor from his Companions that they engaged in congregational supplication immediately after prayers, or after reciting the Quran, or after every lesson. Whoever commits to such practices has introduced an innovation into the religion. Citing the verse "Call upon Me; I will respond to you" does not justify this, because it is general, and goodness lies in following the guidance of the Prophet (peace be upon him) and his Companions, while evil lies in following innovations.