Sasine in Scots law is the delivery of feudal property, typically land.
A superior (e.g., a heritor) might authorise his agent or factor to give possession of his property to someone else through a document known as a "precept of sasine".
The term 'Instrument of Sasine' was actually the recording of the event of the symbolic delivery of the property as witnessed, and minuted, by a Court Official in attendance for that purpose.
The "instrument of sasines" was superseded by the recording of the conveyance with a "warrant of registration" by an act of 1858.
The last legal ceremony of sasine in Scotland was performed in 2002 as Glenmorangie handed over the land of St Mary's Chapel in Easter Ross to the Cadboll Trust.