折箭为誓 [- - - shì]A vow is taken with the breaking of an arrow — an old custom like “Kissing of the Book”.; swear by breaking an arrow; break an arrow as a pledge; break an arrow in two and make a vow:
•¶折箭为誓， 洒酒奠地 take an oath, break an arrow and scatter a cup of wine on the ground