What language did Abraham speak?

Tough question but I believe Abraham PBUH spoke non-Semitic Sumerian mixed with Semitic languages such as Akkadian. Abraham grew up in a polytheistic society and many of the idols (gods) were of Sumerian descent. Later the area became all Akkadian, long after Abraham had moved on to what is now present day Turkey, Palestine, etc. I hope this helps. But nonetheless I say thanks for now I will review my history books again and refresh my knowledge.