The presidential advisor on security has urged the displaced people to return home.
The call comes after the signing of the revitalized peace agreement in Addis Ababa on Wednesday.
Tut Gatluak said the signing marks the end of the conflict in the country.
He believes that South Sudan will not return to civil war.
“Peace has finally come. We signed the peace in Addis Ababa and we assure you that this peace is permanent. There is no fighting again in South Sudan,” said Mr Gatluak.
He was speaking to journalists in Juba on Thursday, upon the arrival of President Salva Kiir from the Ethiopian capital, Addis Ababa.
According to the UN, there are more than 2 million South Sudanese refugees in the neighboring countries, including Uganda and Kenya.
It also indicates that nearly 2 million people are sheltering in IDP camps across the country.