For this reason the scholars have placed certain rules to accepting any narration from Seif ibn 'Umar:
1- What he says needs to have a Sahih foundation in the books of Hadith(i.e Sahih al-Bukhari) and it has to be taken from the reliable historical sources(i.e Tareekh al-Tabari).
2- His narrations must not have anything related to 'Aqeedah and matters of Halal and Haram.
3- His narrations must be free from any attacks on any of the companions.
4- His narration must not be biased towards certain well known political positions during the rightly-guided caliphate.