Comparative evidence

h₃er

• Hitt. arai- /ari- 'rise', 'arise', 'lift', 'raise' (EDHIL: 200) LIV2: 252 assigns this verb to the root *h1rei-.However, Kloekhorst (EDHIL: 200) is correct that this verb contains the suffix *-oi/i- and goes back to the root *h3er-.

• Hitt. ar- 'stand' (EDHIL: 195). LIV2: 238 incorrectly assigns this verb to the root *h1er-.

References

EDHIL = Kloekhorst, A. 2008. Etymological Dictionary of the Hittite Inherited Lexicon. Brill.
LIV2: = Rix, H. et. al. 2001. Lexikon der indogermanischen Verben. 2. Auflage. Reichert.