John Calvin on Romans 16:6

6. He again testifies his gratitude, in recording the kindness of Mary to him. Nor is there any doubt but that he commemorates these praises, in order to recommend those whom he praised to the Romans. It is said of Mary, that she “labored much,” εἰς ἡμᾶς, towards us, or among us; “inter nos — among us,” Beza; “pro nobis — for us,” Grotius. The reading εἰς ὑμᾶς, towards you, has many MSS. in its favor, and also ἐν ὑμῖν, among you. — Ed.