I can't find a specific scriptures, help please

Hello
Someone can help me to find a scripture?
I do not remember in detail what the scripture says but here is the meaning: you ask the Lord to receive more testimonies when you have already received a lot. it seems to me that this scripture is in the New Testament
Thank you
David V

Are you thinking of Doctrine and Covenants 6, in particular verses 14 and 22–23?