Most commentators, as well as the editors of both the NA28 and UBS5, identify Acts 3.22–3 as a composite citation of Deut 18.15–19 and Lev 23.29. Problems arise, however, when they try to explain why Luke combines these two texts. Luke’s typical practice for composite citations is to combine texts which share a common theme or otherwise mutually interpret each other, but none of the suggested connections between Deut 18.15–19 and Lev 23.29 have proven convincing. This paper demonstrates that while scholars have correctly identified Deut 18.15–19 as one of the texts cited, the text with which Luke combines it ought to be identified as Num 15.30 rather than Lev 23.29. Both Deut 18.18–19 and Num 15.30–1 describe the consequences of deliberately rejecting the ‘word of the Lord’. Correctly identifying these texts confirms Luke’s general practice in composite citations and also clarifies the function of this citation in its context in Acts 3.12–26. Using this composite citation, Peter warns those who had previously acted in ignorance against now opposing God deliberately.