《礼记·少仪》
国君将到他国出访，臣下如果要向国君赠送金玉货币等物，应该谦让地说： 这是送给陛下随从的一点养马费用。 
君将适他，臣如致金玉货贝于君，则曰： 致马资于有司 ；敌者曰： 赠从者 。
If a monarch is going on a diplomatic mission to another country and his ministers want to give him gold, jade, or currencies, they should be modest and say: "This is just a small amount I send to help feed your horses."