Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said concerning "If he was from a people hostile to you" [Surah al-Nisa: 92]: If (the one killed) is a believer and his people are polytheists, then there is no blood money, rather only the freeing of a slave. And "If he was from a people between whom and you there is a covenant" [Surah al-Nisa: 92] means a treaty: "then blood money handed over to his family and the freeing of a believing slave" [Surah al-Nisa: 92].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسامة / 16475