Have the scholars unanimously agreed on the desirability of remaining silent regarding permissible speech? And have they differed in their interpretation of the Hadith: "Whoever believes in Allah and the Last Day, let him speak good or remain silent," even though the Messenger of Allah, may Allah bless him and grant him peace, used to speak about permissible matters? And has anyone interpreted "let him speak good" as the opposite of evil, which may include what is permissible?

It is not easy to assert the existence of a consensus on a specific matter. For a legal ruling to be established, it suffices for there to be evidence for it from the Qur'an or Sunnah, or for it to be analogous to something for which there is evidence, and that it is not contradicted by stronger evidence.

The Hadith of the Prophet, peace and blessings be upon him, "Whoever believes in Allah and the Last Day, let him speak good or remain silent," indicates the obligation to observe silence, and speaking good is better than silence. Thus, the gain (speaking good) is better than safety (silence).

As for what might be imagined as a contradiction between the Prophet's, peace and blessings be upon him, command to remain silent about the permissible and his own speech regarding the permissible, it is an illusion from two perspectives: 1. The Prophet's life, peace and blessings be upon him, was an example of complete humanity. He was cheerful, smiled, joked, and spoke nothing but the truth, which is considered among the good deeds commanded to be done, not among the permissible things commanded to be silent about. 2. The command to remain silent is out of fear of falling into error, and the Prophet, peace and blessings be upon him, was infallible from that.