《旧唐书·列传·卷一百一十》
一两年来，每日做诗，彼此赠答唱和，不觉越来越多。
一二年来，日寻笔砚，同和赠答，不觉滋多。
For one or two years, he wrote poetry every day, and they gifted and exchanged poems to each other, and their numbers grew without their noticing.