Translation of the verse 31 from Surah Adh-Dhariyat : Number of verses 60 - - page 522 - Part 27.
[Ibrahim (Abraham)] said: "Then for what purpose you have come, O Messengers?"
[Abraham] said, "Then what is your business [here], O messengers?"
(51:31) Abraham said: 'Envoys (of Allah), what is your errand?' *30
*30) As the angels come in human guise only on highly important occasions the Prophet Abraham used the word khatb to find out the purpose of their visit; the word khatb in Arabic is used for an errand of same extraordinary nature.
Source : Adh-Dhariyat Verse 31: [Abraham] said, "Then what is your business [here], O messengers?"