To Gain and to Give: Hilchot Tzedakah, Day 9
One who wishes to be virtuous should contribute generously towards mitzvos from the best and finest that they have. This means that when giving money, one should give magnanimously. When giving items, one should give from the best items that they have. For example, when donating to a clothing or food drive, one should donate high quality clothing and food.
שו"ע ס' רמח ס"ח