Allah said,

﴿ظˆظژط¥ظگظ„ظژظ‰ ط«ظژظ…ظڈظˆط¯ظژ﴾

(And to Thamud), meaning, to the tribe of Thamud, We sent their brother Salih,

﴿ظ‚ظژط§ظ„ظژ ظٹظژط§ظ‚ظژظˆظ’ظ…ظگ ط§ط¹ظ’ط¨ظڈط¯ظڈظˆط§ظ’ ط§ظ„ظ„ظ‘ظژظ‡ظژ ظ…ظژط§ ظ„ظژظƒظڈظ…ظ’ ظ…ظ‘ظگظ†ظ’ ط¥ظگظ„ظژظ€ظ‡ظچ ط؛ظژظٹظ’ط±ظڈظ‡ظڈ﴾

(He said: "O my people! Worship Allah! You have no other god but Him.'') All Allah's Messengers called to the worship of Allah alone without partners. Allah said in other Ayat,

﴿ظˆظژظ…ظژط¢ ط£ظژط±ظ’ط³ظژظ„ظ’ظ†ظژط§ ظ…ظگظ† ظ‚ظژط¨ظ’ظ„ظگظƒظژ ظ…ظگظ† ط±ظ‘ظژط³ظڈظˆظ„ظچ ط¥ظگظ„ط§ظ‘ظژ ظ†ظڈظˆط­ظگظ‰ ط¥ظگظ„ظژظٹظ’ظ‡ظگ ط£ظژظ†ظ‘ظژظ‡ظڈ ظ„ط§ ط¥ظگظ„ظژظ€ظ‡ظژ ط¥ظگظ„ط§ظ‘ظژ ط£ظژظ†ظژط§ظ’ ظپظژط§ط¹ظ’ط¨ظڈط¯ظڈظˆظ†ظگ ﴾

(And We did not send any Messenger before you but We revealed to him (saying): "None has the right to be worshipped but I, so worship Me.'') ﴿21:25﴾ and,

﴿ظˆظژظ„ظژظ‚ظژط¯ظ’ ط¨ظژط¹ظژط«ظ’ظ†ظژط§ ظپظگظ‰ ظƒظڈظ„ظ‘ظگ ط£ظڈظ…ظ‘ظژط©ظچ ط±ظ‘ظژط³ظڈظˆظ„ط§ظ‹ ط£ظژظ†ظگ ط§ط¹ظ’ط¨ظڈط¯ظڈظˆط§ظ’ ط§ظ„ظ„ظ‘ظژظ‡ظژ ظˆظژط§ط¬ظ’طھظژظ†ظگط¨ظڈظˆط§ظ’ ط§ظ„ظ’ط·ظ‘ظژظ€ط؛ظڈظˆطھظژ﴾

(And verily, We have sent among every Ummah a Messenger (proclaiming): "Worship Allah (Alone), and avoid Taghut (all false deities)'') ﴿16:36﴾.