Musnad Ahmad 32:2163

Ali ibn Abdullah narrated to us, Mu'adh ibn Hisham narrated to us, my father narrated to us, from Qatadah, Anas ibn Malik narrated to us, that the Prophet of Allah, may Allah bless him and grant him peace, said: "It will be said to the disbeliever on the Day of Resurrection: 'Do you see, if you had the earth full of gold, would you ransom yourself with it?' He will say: 'Yes.' He said: 'Then it will be said to him: You were asked for something easier than that.'"