Proto-MSA

*lV- - against, on (Kogan 2015:562)

As duly recognized by both Leslau and Johnstone, the MSA prepositions are semantically equivalent to PS *ˁalay rather than to PWS *li. The etymological *ˁ persists in the Soqotri forms with pronominal suffixes such as ˁəy ‘on him.’ (Kogan 2015:562)

Mehri
l-/lə- - against, on (ML 249)
Jibbali
l- - for, against, on to (JL 158)
Soqotri
ḷe- - on, over, against (LS 227, CSOL I 598, CSOL II 522 – 523)