أَمْلِكْ عَلَيْكَ لِسَانَكَ
“Keep control over your tongue.”
أَمْلِكْ is an imperative, telling the addressee to do something. It comes from the root م ل ك, associated with possession and control. لِسَانَكَ means “your tongue”; لِسَانَ functions as the object, while كَ means “your.”
عَلَيْكَ reinforces the idea of maintaining restraint. The grammar matters here because the command asks for an active, deliberate effort rather than passive silence.