Sayyiduna Itban bin Malik (may Allah be pleased with him) narrates to Mahmud bin al-Rabi' (may Allah be pleased with him): Something afflicted my eyesight, so I sent word to the Messenger of Allah (peace and blessings be upon him) that I would like you (peace and blessings be upon him) to come to my house and pray there, so that I may take it as a place of prayer. So the Prophet (peace and blessings be upon him) came to me, along with those of his (peace and blessings be upon him) Companions whom Allah willed. He (peace and blessings be upon him) entered my house and began to pray, while his (peace and blessings be upon him) Companions began talking among themselves and mentioning the hypocrites. Then they attributed the gravest part of the matter to Malik bin al-Dukhshum; they wished that he (peace and blessings be upon him) would supplicate against him so that he would perish, they wished that some harm would befall him. The Messenger of Allah (peace and blessings be upon him) completed the prayer and said: "Does he not testify that there is no true god but Allah and that I am the Messenger of Allah?" The people said: He says that with his tongue, but it is not in his heart. He (peace and blessings be upon him) said: "No one who testifies that there is no true god but Allah and that I am the Messenger of Allah will enter the Fire, nor will the Fire consume him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15134