The Prophet (ﷺ) said, “Take the Suhur (pre-dawn meal) as there is a blessing in it.” (Bukhaari and Muslim)
Shaykh ‘Ubayd al-Jaabiri said:
This shows you that it is Sunnah, the word blessing (barakah) means ‘ziyada’ – which is Increase of something).The Suhoor itself is barakah as the Shaykh said. The barakah that one attains from the Suhoor is that he becomes strong in his fasting, the person who has strength and is active is able to do many things, especially if one were to take their Suhoor close to the Fajr time. It will give him that blessing of reaching the Fajr prayer with strength. It will give him strength for the rest of the day. Likewise, the person who has taken the suhoor meal will be able to read much Qur’an and pray the extra voluntary prayers. He will be able to fulfil his worldly affairs and needs.
[Taken from the Lulu wal Marjan Class, Kitaab Al-Siyaam]