Determining the "first" language on Earth is impossible. The earliest known language with written records is Sumerian, spoken in ancient Mesopotamia around 3500 BCE.
While Sumerian is considered the oldest documented language, it's crucial to remember that language evolved gradually over millennia. The languages spoken before Sumerian were likely lost to time, as they lacked written forms.
The development of languages predates recorded history, making it impossible to pinpoint the exact "first" language. However, Sumerian provides valuable insight into the evolution of language and writing systems.