1 Corinthians 14:2
1 Corinthians 14:22For he who speaks in a tongue does not speak to men, but to God. Indeed, no one understands him; he utters mysteries in the Spirit.
rs draws a strong dichotomy between "real Acts 2 xenolalia" (foreign languages used for missional communication) and "modern charismatic babble" — genuine biblical tongues were always known languages used evangelistically. 14:2 tends to be left unengaged or quickly reframed, because its plain description of tongues directed not to hearers but to God cuts against the "missional foreign languages only" binary the rs book relies on.
14:2 in the NWT: "he who speaks in a tongue speaks, not to men, but to God, for no one listens, but he speaks sacred secrets by the spirit." Paul himself recognises a category of tongues directed TO God rather than to hearers. This is prayer-language, not xenolalia for evangelism. The rs book's dichotomy — "real missional tongues vs. fake modern babble" — is a false binary Paul does not allow. You do not have to endorse all modern charismatic practice to notice that Paul himself describes two kinds of tongues. At the door: "Paul in your own NWT at 14:2 says tongues can be directed to God rather than men — that is not missional foreign language, that is prayer. If Paul allows that category, the rs dichotomy collapses."