1؎: Hammam ibn Yahya and Amir al-Ahwal both used to make mistakes, so it is possible that in this narration, one of them made a mistake and narrated "three" instead of "two." However, from Abu Hurairah radi Allahu anhu, through another (weak) chain, there is a similar narration in Ibn Majah (no. 415).
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
1: Both Hammam ibn Yahya and Amir al-Ahwal used to become confused, so it is possible that in this narration, one of them became confused and narrated "three" instead of "two." However, from Abu Hurairah (radi Allahu anhu), there is a similar narration in Ibn Majah (no. 415) through another (weak) chain.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 43