Luke 4:38
And he arose out of the synagogue, and entered into Simon’s house. And Simon’s wife’s mother was taken with a great fever; and they besought him for her.
Cross-reference
Matthew 8:14 parallels the setting, confirming Jesus entered Peter's home and saw his mother-in-law.
Matthew 8:15 details the healing touch and her response, completing the narrative.
Mark 1:29-31 provides the full parallel account of the same event with additional details.
Mark 5:23 records Jairus beseeching Jesus for his dying daughter — a very close parallel to the appeal for Simon's mother-in-law.
1 Corinthians 9:5 confirms Peter (Cephas) had a wife, which explains the mother-in-law in Luke.
James 5:14 instructs calling elders to pray for the sick — a later practice mirroring the intercessory pattern in 4:38.
John 11:3 has Mary and Martha send word about Lazarus's illness — another instance of reporting sickness to Jesus for help.