To have and not give is in some cases worse than stealing.

[Haben und nichts geben, ist in manchen Fällen schlechter als stehlen.]

Marie von Ebner-Eschenbach (1830–1916) Austrian writer

Aphorisms [Aphorismen], No. 41 (1880-1893) [tr. Wister (1882)]
    (Source)

(Source (German)). Another translation:

To have and not give is in some instances worse than stealing.
[tr. Scrase/Mieder (1994)]