'Umar (may Allah be pleased with him) says that wine is made from wheat, then he narrated the entire hadith. Imam Tirmidhi says:
1- It is narrated from 'Umar ibn al-Khattab (may Allah be pleased with him) that wine is made from wheat; this narration is more authentic than that of Ibrahim ibn Muhajir 1؎,
2- 'Ali ibn al-Madini says: Yahya ibn Sa'id said: Ibrahim ibn Muhajir is not strong in narrating hadith,
3- This hadith has also come from Nu'man ibn Bashir through other chains.