Abraham sent him to Mesopotamia to obtain a God - fearing wife for Isaac. Eliezer prayed for divine guidance and recognized it as such when Rebekah watered his camels.
وَصَلَّى أَلِيعَازَرُ إِلَى ٱللهِ طَالِبًا تَوْجِيهَهُ فِي ٱلْمَسْأَلَةِ ،‏ وَأَدْرَكَ حِينَ سَقَتْ رِفْقَةُ جِمَالَهُ أَنَّ يَهْوَه هُوَ ٱلَّذِي وَجَّهَ ٱلْأُمُورَ .‏