A.T. Robertson Commentary John 13:20

"Verily, verily, I say unto you, he that receiveth whomsoever I send receiveth me; and he that receiveth me receiveth him that sent me." — John 13:20 (ASV)

Whomsoever I send (αν τινα πεμψω). More precisely, "If I send any one" (third-class condition, αν=εαν and τινα, indefinite pronoun accusative case, object of πεμψω, first aorist active subjunctive of πεμπω, to send). This use of ε τις or εαν τις (if any one) is very much like the indefinite relative οστις and ος αν (or εαν), but the idiom is different. In Mr 8:34f. we have both ε τις θελε and ος εαν while in Joh 14:13f. we find οτ αν and εαν τ (Robertson, Grammar, p. 956).