Numbers 1:49
"Only the tribe of Levi you shall not number, neither shall you take a census of them among the children of Israel;
Numbers 26:62
Those who were numbered of them were twenty-three thousand, every male from a month old and upward: for they were not numbered among the children of Israel, because there was no inheritance given them among the children of Israel.
Numbers 2:33
But the Levites were not numbered among the children of Israel; as Yahweh commanded Moses.
Treasury of Scripture Knowledge
Summary
                            Only thou shalt not number the tribe of Levi, neither take the sum of them among the children of Israel:                        
                    General references
Bible References
General references
                                        Numbers 2:33                                        
                                                                                                                                But the Levites were not numbered among the children of Israel; as Yahweh commanded Moses.
                                    
                                        Numbers 26:62                                        
                                                            
                        Those who were numbered of them were twenty-three thousand, every male from a month old and upward: for they were not numbered among the children of Israel, because there was no inheritance given them among the children of Israel.