Commentators observe that this phrase marks a formal introduction, signaling that God is about to provide the reason for His commands regarding the Levites. John Gill notes it's a continuation of God's speech, while Matthew Henry uses it to frame the principle that follows: "Those whom God finds work for, he will find help for." This verse, therefore, emphasizes that God often explains the 'why' behind His instructions, in this case, providing the Levites to assist the priests.