John Gill Commentary Luke 8:50

"But Jesus hearing it, answered him, Fear not: only believe, and she shall be made whole." — Luke 8:50 (ASV)

But when Jesus heard it
The message that was brought to the ruler, and the hint that was given, that it was needless to give him any further trouble:

he answered him ;
not the messenger, but the father of the child, as the Vulgate Latin, Syriac, Persic, and Ethiopic versions read:

saying, fear not :
do not be dismayed at this message, nor despair of help, notwithstanding such is the case:

believe only, and she shall be made whole ;
exercise faith in me, that I am able to raise her from the dead, and I will do it; and she shall be restored to life, and to perfect health and strength again.