Sahih al-Bukhari Book 68, Hadith 47
The Prophet (ﷺ) said, "The call (or the Adhan) of Bilal should not stop you from taking the Suhur-meals for Bilal calls (or pronounces the Adhan) so that the one who is offering the night prayer should take a rest, and he does not indicate the daybreak or dawn." The narrator, Yazid, described (how dawn breaks) by stretching out his hands and then separating them wide apart.
We were with Allah's Messenger (ﷺ) on a journey, and when the sun set, he said to a man, "Get down and prepare a drink of Sawiq for me." The man said, "O Allah's Messenger (ﷺ)! Will you wait till it is evening?" Allah's Messenger (ﷺ) again said, "Get down and prepare a drink of Sawiq." The man said, "O Allah's Apostle! Will you wait till it is evening, for it is still daytime. " The Prophet (ﷺ) again said, "Get down and prepare a drink of Sawiq." So the third time the man got down and prepared a drink of sawiq for him. Allah's Messenger (ﷺ) drank thereof and pointed with his hand towards the East, saying, "When you see the night falling from this side, then a fasting person should break his fast."
Allah's Messenger (ﷺ) said, The example of a miser and a generous person is like that of two persons wearing iron cloaks from the breast upto the neck When the generous person spends, the iron cloak enlarges and spread over his skin so much so that it covers his fingertips and obliterates his tracks. As for the miser, as soon as he thinks of spending every ring of the iron cloak sticks to its place (against his body) and he tries to expand it, but it does not expand. The Prophet (ﷺ) pointed with his hand towards his throat.