Godsend (noun)

1. Something that comes unexpectedly and is very helpful or beneficial.
2. A person or thing that is a great help in a difficult situation.

Origin:

From god + send.

Examples:

1. The rain was a godsend to the parched farmers.
2. The new job was a godsend for her finances.
3. The umbrella was a godsend on that rainy day.
4. The baby's unexpected arrival was a godsend for the lonely couple.
5. The medicine was a godsend for his ailing health.