It is narrated from Sayyiduna Walid bin Uqbah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Some of the people of Paradise will go to some of the people of the Fire and say: 'Why did you enter the Fire? By Allah, we only entered Paradise because of what we learned from you.' They will say: 'We used to say, but we did not do.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18625