[rayiner]

Egyptian hieroglyphics already had alphabetic elements, and the canaanites borrowed those: https://en.wikipedia.org/wiki/Egyptian_hieroglyphs (“Egyptian hieroglyphs are the ultimate ancestor of the Phoenician alphabet, the first widely adopted phonetic writing system”).

[canjobear]

Egyptian writing had phonetic elements (as does the modern Chinese writing system) but it was not an alphabet in the strict linguistic sense that individual symbols indicated individual phonemes.

[reissbaker]

Egyptian heiroglyphs were not an alphabet, even if they had alphabetic elements (in addition to pictographic ones). Scholars generally agree that proto-Sinaitic was the first alphabet, and all subsequent alphabets used today are either direct descendants or directly inspired by it. https://en.wikipedia.org/wiki/History_of_the_alphabet

[ummonk]

Protp-Sinaitic was an abjad not an alphabet.

[reissbaker]

As per the Wikipedia links, it's generally considered by scholars to be the origin of all alphabets and an early alphabetic script. Abjad is a term invented in 1990 to distinguish early alphabetic scripts without vowels from later scripts with them. Effectively every scholar agrees that Canaanite/Aramaic/Hebrew/Arabic are alphabetic systems (while also acknowledging them as abjads).