New Revised Standard Version
But overhearing what they said, Jesus said to the leader of the synagogue, “Do not fear, only believe.”

Contemporary English Version
Jesus heard what they said, and he said to Jairus, "Don't worry. Just have faith!"

New American Bible
Disregarding the message that was reported, Jesus said to the synagogue official, “Do not be afraid; just have faith.”

Douay-Rheims Bible
But Jesus having heard the word that was spoken, saith to the ruler of the synagogue: Fear not, only believe.

But Jesus having heard the word that was spoken, saith to the ruler of the synagogue: Fear not, only believe.

only.

Mark 5:34 And he said to her: Daughter, thy faith hath made thee whole: go in peace, and be thou whole of thy disease.

Mark 9:23 And Jesus saith to him: If thou canst believe, all things are possible to him that believeth.

2 Chronicles 20:20 And they rose early in the morning, and went out through the desert of Thecua: and as they were marching, Josaphat standing in the midst of them, said: Hear me, ye men of Juda, and all the inhabitants of Jerusalem: believe in the Lord your God, and you shall be secure: believe his prophets, and all things shall succeed well.

Matthew 9:28,29 And when he was come to the house, the blind men came to him. And Jesus saith to them, Do you believe, that I can do this unto you? They say to him, Yea, Lord. . . .

Matthew 17:20 But this kind is not cast out but by prayer and fasting.

Luke 8:50 And Jesus hearing this word, answered the father of the maid: Fear not. Believe only: and she shall be safe.

John 4:48-50 Jesus therefore said to him: Unless you see signs and wonders, you believe not. . . .

John 11:40 Jesus saith to her: Did not I say to thee that if thou believe, thou shalt see the glory of God?

Romans 4:18-24 Who against hope believed in hope; that he might be made the father of many nations, according to that which was said to him: So shall thy seed be. . . .