Sakinah (Arabic: سـكـن, "peace", "serenity" or "tranquility") also appears in the Qur'an.
It is a derivative of the original word "Sakina" which is mentioned in the Qur'an as having descended upon the Islamic Prophet (Arabic: نَـبِي, nabi) Muhammad and the believers as they made an unarmed pilgrimage to Mecca, and were faced with an opposing military force of the Quraysh, with whom Muhammad struck the Treaty of Hudaybiyah.
[1] Sakinah is further mentioned in the following verse: "While the Unbelievers got up in their hearts heat and cant - the heat and cant of ignorance,- Allah sent down Sakīnaṫahu (Arabic: سـكـيـنـتـه, His Tranquility) to his Messenger and to the Believers, and made them stick close to the command of self-restraint; and well were they entitled to it and worthy of it.
"[5] Another Qur'anic verse portrays sakinah as reassurance: "Allah's Good Pleasure was on the Believers when they swore Fealty to thee under the Tree: He knew what was in their hearts, and He sent down Sakina - tranquillity (alssakeenata) to them; and He rewarded them with a speedy Victory" (48:18).
Sufi reference to sa-ka-na as meaning both stillness and habitation adds to the identity with Shekhinah's indwelling nature.