Just as people are destined to die once, and after that to face judgment, so Christ was sacrificed once to take away the sins of many; and he will appear a second time (in the Heavenly Court), not to bear sin (as a sin offering), but to (render judgment that will) bring salvation to those who are waiting for (even waiting before) him. (Hebrews 9:27-28)
I’ve added some things in brackets here simply for the purpose of helping readers understand the context in which these verses have been written. If you carefully consider these verses in the context that they are written, it should not be hard to see that human beings dying once in a lifetime and then appearing as spirit for judgment in the spirit-world to determine what is the next and best step for that spirit, is being compared to Christ being sacrificed once for the sins of all and then Him appearing another time (in another way) in the Heavenly Court for the purpose of determining what is the next and best step for those whose case has come before Him. These verses in no way convey a message that the judgment for spirits cannot be for them to have another human experience, nor do they convey a “second coming of Christ” message as that is taught in most Christian churches today. These verses are simply showing Christ’s role in the forgiveness and the deliverance of all men, beloved, and they also show us a little bit about the heavenly process for this.