Musnad Ahmad 30:1049

The Messenger of Allah, may Allah bless him and grant him peace, said: "Indeed, the lowest seat of any one of you in Paradise is that He says to him: 'Wish,' so he wishes and wishes. Then He says to him: 'Have you wished?' He says: 'Yes.' Then He says to him: 'Indeed, you shall have what you wished for, and the like of it along with it.'"