אדם כי יקריב מכם…תקריבו את קרבנכם, אם עולה קרבנו (ויקרא א:ב-ג)

The Passuk starts כי יקריב אדם in the singular form, continues in the plural form את קרבנכם  תקריבו, and then switches back to the singular form: אם עולה קרבנו. 

The reason for this sequencing is to teach us that “כל ישראל ערבים זה לזה” – all Yidden are responsible for one another.  If a Yid commits an aveira (transgression), all Yidden should be punished for their sin.  Therefore, when one does Teshuvah (repentance) and brings a korban to Hashem – the korban is for all the Yidden to save them from punishment.