Luke was not lying. But the English translation might be. The issue boils down to whether one deems the "appointed" word (
tetagmenoi) as a
passive or
middle voice. Naturally, all mainline translations assume the
passive voice. The middle voice would indicate that they had "placed themselves" in a favorable position for salvation instead of the passive, "were placed". However, the verse is not standing by itself. It's standing within a context. If there is an answer as to which voice is intended, the context is where it will be found. The Bible interprets itself, if we will but allow it.
In the narrow context, the Jews had begun to blaspheme and the apostles responded, "
It was necessary that the word of God should be spoken to you first. Since you repudiate it, and judge yourselves unworthy of eternal life, behold, we are turning to the Gentiles" (Acts 13:46). The contrast Luke makes between the words of the apostles and his own statement in Acts 13:48 is clear. Since the Jews had
put themselves in a position hostile to eternal life, the apostles were very explicit with the use of the reflexive pronoun "yourselves" to indicate that
the cause was their attitude. Then Luke, in explaining the opposite response of the Gentiles, would be most likely intending a reflexive middle to describe
their attitude, which in 13:42 was evinced in their pleading with the apostles to come back on a second Sabbath to give the word of God. The parallel is striking.
In the broader context of Luke's statements in Acts, we have a close parallel in Iconium: "
...they entered the synagogue of the Jews together, and spoke in such a manner that a great multitude believed, both of Jews and of Greeks" (Acts 14:1). Here, Luke describes a human cause for many coming to faith, "...speaking is such a manner!..". He does not attribute it to irresistible grace or predestination.
There is another close parallel in Berea: "
Now these were more nobleminded than those in Thessalonica, for they received the word with great eagerness, examining the Scriptures daily, to see whether these things were so. Many of them therefore believed, along with a number of prominent Greek women and men" (Acts 17:11-12). Again, the "therefore" emphasizes the cause.
These are examples of people, by their own action and decisions, putting themselves in a position to receive the Gospel and to believe. We are therefore on safe ground in determining that the middle voice is indicated in Acts 13:48. The Bible is its own commentary.
So the verse should be rendered something like,
Hearing it then, the Gentiles were rejoicing and glorifying the word of the Lord and as many as had devoted themselves to eternal life, believed.