Recommendation to eat suhur close to start of Fajr
BUKHARI 575:
from Zayd b. Thābit —
they took the Suhur (predawn meal) with the Prophet ﷺ and then stood up for the (morning) prayer. I asked him: "How long was the interval between the two (Suhur and Fajr)?" He replied: "The interval between the two was just sufficient to recite fifty or sixty ayah."
البخاري ٥٧٥:
عن زيد بن ثابت —
«أَنَّهُمْ تَسَحَّرُوا مَعَ النَّبِيِّ ﷺ، ثُمَّ قَامُوا إِلَى الصَّلَاةِ، قُلْتُ: كَمْ بَيْنَهُمَا؟ قَالَ: قَدْرُ خَمْسِينَ أَوْ سِتِّينَ يَعْنِي آيَةً»