雪中送炭 (xuě zhōng sòng tàn): lit. to send charcoal in snowy weather; fig. to provide help in sb's hour of need

雪xuě中zhōng送sòng炭tàn

lit. to send charcoal in snowy weather; fig. to provide help in sb's hour of need

Bringing coal in the snow: help exactly when it is needed. Warmer praise than 锦上添花.