In your hour of need - Idioms by The Free Dictionary
in your hour of need
in (one's) hour of need
At the point in time when someone needs help the most. I'll always be indebted to Janet for standing by me in my hour of need.
in your ˌhour of ˈneed (often humorous) when you really need help: Where were you in my hour of need? Sitting in a cafe with your friends!