SB 8.19.36
na tad danam prasamsanti
yena vrttir vipadyate
danam yajñas tapah karma
loke vrttimato yatah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Learned scholars do not praise that charity which endangers one’s own livelihood. Charity, sacrifice, austerity and fruitive activities are possible for one who is competent to earn his livelihood properly. [They are not possible for one who cannot maintain himself.]