A friend in need is a friend indeed

परोऽपि हितवान् बन्धुः
बन्धुरप्यहितः परः ।
अहितो देहजो व्याधिः
हितमारण्यमौषधम् ॥

- हितोपदेशः

One who helps us in difficult times should be considered as a relative (or a friend), even if he is a stranger. One who hurts us, should be considered as a stranger, even if he is our relative. Though a disease resides in our body, it is harmful. But a medicinal plant that grows in a forest, saves lives.

A friend in need is a friend indeed.