What is the two-part allegorical saying for sending goose feathers a thousand miles away?

Send goose feathers a thousand miles away-courtesy is light and affection is heavy

Metaphor gift is meager, but it contains deep friendship.

The story of "A Thousand Miles to Send Goose Feathers" was originally about a special envoy from a remote area named Mian Bogao who took a swan to Chang 'an to pay tribute. The goose feathers on the road were dirty, so he opened the cage by Mianyang Lake and let the swan wash its feathers. Unexpectedly, the swan spread its wings and flew away. Mian Bogao fell into the lake and cried. Later, he used his quick wits, picked up a feather, went to Chang 'an to pay tribute, and was rewarded by Tang Gaozong, which became a much-told story. Modern people often paint their gifts with "goose feathers sent a thousand miles away".