Which line form "to my dear loving husband" contains metaphor

Answer

The metaphor you are looking for is "My love is such that rivers cannot quench"

Explanation

The metaphor is used in the sentence as an implied comparison. As in the present verse. there is an implicit comparison of "my love" with fire. Thus by saying that even a large amount of water like "rivers" cannot quench my love reveals that the poet's love is everlasting and it remains substantial.