A man was taken to hospital on Wednesday morning suffering from stab wounds after an assault at a house in William Street, Grantham.
Police were called at 7.56am after reports that a man had been assaulted in the house.
The victim, a 32-year-old local man, is being been treated at Grantham Hospital.
He is reported to be in a stable condition.
A 24-year-old local man was arrested in connection with the incident and is currently helping police with their enquiries.