TABARANI 7125:
from Shaddād b. Aws —
[Machine] The Prophet ﷺ once encountered a man who was fasting on the 18th of Ramadan, and I was with him. He said, "The one who observes ihtikaam and the one who practices tahajjud fast."
الطبراني ٧١٢٥:
عن شداد بن اوس —
مَرَّ النَّبِيُّ ﷺ بِرَجُلٍ يَحْتَجِمُ فِي ثَمَانِ عَشْرَةَ مِنْ رَمَضَانَ وَأَنَا مَعَهُ فَقَالَ «أَفْطَرَ الْحَاجِمُ وَالْمَحْجُومُ»