Question: What is the ruling for participating in protests, and if they are permissible, what is the proof?
Answer: Protests are a means by which the Muslim community makes its voice heard regarding a specific issue, to those in authority so they can act accordingly or respond to their concerns. In the modern age, this has become the main objective behind protests: informing governments about the concerns of the governed.
Islam as a faith welcomes protests according to the definition provided above, because they serve the Muslim community to make its positions known on issues. Especially if that issues pertains to a general benefit that affects Muslims or Muslim countries such as Palestine, in general, and Gaza, in particular.