Srimad Bhagavatam Canto 01, Chapter 06, Text 09

SB 1.6.9

ekada nirgatam gehad
duhantim nisi gam pathi
sarpo ’dasat pada sprstah
krpanam kala-coditah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Once upon a time, my poor mother, when going out one night to milk a cow, was bitten on the leg by a serpent, influenced by supreme time.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
That is the way of dragging a sincere soul nearer to God. The poor boy was being looked after only by his affectionate mother, and yet the mother was taken from the world by the supreme will in order to put him completely at the mercy of the Lord.
 
Srimad Bhagavatam Canto 01, Chapter 06, Text 08
Srimad Bhagavatam Canto 01, Chapter 06, Text 10