The Thamūd were a people of ancient Arabia

Arabian Peninsula

The Arabian Peninsula is a land mass situated north-east of Africa. Also known as Arabia or the Arabian subcontinent, it is the world's largest peninsula and covers 3,237,500 km2...

 who were known from the 1st millennium BC to near the time of Muhammad

Muhammad

Muhammad |ligature]] at U+FDF4 ;Arabic pronunciation varies regionally; the first vowel ranges from ~~; the second and the last vowel: ~~~. There are dialects which have no stress. In Egypt, it is pronounced not in religious contexts...

. Although they are thought to have originated in southern Arabia, Arabic tradition has them moving north to settle on the slopes of Mount Athlab near Mada'in Saleh. According to the Qur'an

Qur'an

The Quran , also transliterated Qur'an, Koran, Alcoran, Qur’ān, Coran, Kuran, and al-Qur’ān, is the central religious text of Islam, which Muslims consider the verbatim word of God . It is regarded widely as the finest piece of literature in the Arabic language...

, the Thamud were punished and destroyed by an earthquake (rajfa).

Numerous Thamudic rock writings and pictures

Petroglyph

Petroglyphs are pictogram and logogram images created by removing part of a rock surface by incising, picking, carving, and abrading. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions of the technique to refer to such images...

 have been found on Mount Athlab and throughout central Arabia.
The oldest known reference to Thamud is a 715 BC inscription of the Assyria

Assyria

Assyria was a Semitic Akkadian kingdom, extant as a nation state from the mid–23rd century BC to 608 BC centred on the Upper Tigris river, in northern Mesopotamia , that came to rule regional empires a number of times through history. It was named for its original capital, the ancient city of Assur...

n king Sargon II

Sargon II

Sargon II was an Assyrian king. Sargon II became co-regent with Shalmaneser V in 722 BC, and became the sole ruler of the kingdom of Assyria in 722 BC after the death of Shalmaneser V. It is not clear whether he was the son of Tiglath-Pileser III or a usurper unrelated to the royal family...

 which mentions them as being among the people of eastern and central Arabia subjugated by the Assyrians

Assyrian people

The Assyrian people are a distinct ethnic group whose origins lie in ancient Mesopotamia...

.

They are referred to as "Tamudaei" in the writings of Aristo of Chios, Ptolemy

Ptolemy

Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...

, and Pliny

Pliny the Elder

Gaius Plinius Secundus , better known as Pliny the Elder, was a Roman author, naturalist, and natural philosopher, as well as naval and army commander of the early Roman Empire, and personal friend of the emperor Vespasian...

.
The Qur'an mentions Thamud in Sura

Sura

A sura is a division of the Qur'an, often referred to as a chapter. The term chapter is sometimes avoided, as the suras are of unequal length; the shortest sura has only three ayat while the longest contains 286 ayat...

 Al-A'raf

Al-A'raf

Sura Al-A'raf is the seventh chapter of the Qur'an, with 206 verses. It is a Meccan sura. Its final verse, verse 206, requires a sajdah, or prostration.-Verses:...

 in the context of several prophets who warned their people of coming judgement.