'Abd al-Rahman b. Abu Bakra reported on the authority of his father that a person praised another person in the presence of Allah's Apostle (ﷺ), whereupon he said
Woe be to thee, you have broken the neck of your friend, you have broken the neck of your friend-he said this twice. If one of you has to praise his friend at all, he should say: I think (him to be) so and Allah knows it well and I do not know the secret of the heart and Allah knows the destined end, and I cannot testify his purity against Allah but (he appears) to be so and so.
Abd al-Rahman b. Abu Bakra reported on the authority of his father that a person was mentioned in the presence of Allah's Apostle (ﷺ), and a person said
Allah's Messenger, no person is more excellent than he after Allah's Messenger (ﷺ). Thereupon Allah's Apostle (ﷺ) said: Woe be to thee, you have broken the neck of your friend, and he said this twice. Then Allah's Messenger (ﷺ) said: If anyone has to praise his brother at all, he should say: I think him to be so and so, and even on this he should say: I do not consider anyone purer than Allah (considers).
his hadith has been transmitted on the authority of Shu'ba with a slight variation of wording.
Abu Musa reported Allah's Messenger (ﷺ) saw a person lauding another person or praising him too much. Thereupon he said
You killed him, or you sliced the back of a person.
Abu Ma'mar reported that a person lauded a ruler amongst the rulers and Miqdad began to throw dust upon him and he said
Allah's Messenger (ﷺ) commanded us that we should throw dust upon the faces of those who shower too much praise.
Hammam b. al-Harith reported that a person began to praise 'Uthman and Miqdad sat upon his knee; and he was a bulky person and began to throw pebbles upon his (flatterer's) face. Thereupon 'Uthman said
What is the matter with you? And he said: Verily, Allah's Messenger (ﷺ) said: When you see those who shower (undue) praise (upon others), throw dust upon their faces.
This hadith has been narrated on the authority of Miqdad through another chain of transmitters.