[Machine] The Messenger of Allah ﷺ said, "Do not be deceived by the call to prayer of Bilal, nor by this blackness (referring to dark color of the Abyssinians), until it becomes like this." And he gestured with his hand in a horizontal manner.
قَالَ رَسُولُ اللهِ ﷺ «لَا يَغُرَّنَّكُمْ أَذَانُ بِلَالٍ وَلَا هَذَا السَّوَادُ حَتَّى يَنْفَجِرَ هَكَذَا» وَقَالَ بِيَدِهِ عَرْضًا
"The Messenger of Allah said; 'DO not be confused by the Adhan of Bilal, or by this whiteness, until dawn appears like this" - meaning horizontally. (One of the narrators) Abu Dawud said: "And he spread out his hands gesturing to the right and left."
قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَغُرَّنَّكُمْ أَذَانُ بِلاَلٍ وَلاَ هَذَا الْبَيَاضُ حَتَّى يَنْفَجِرَ الْفَجْرُ هَكَذَا وَهَكَذَا يَعْنِي مُعْتَرِضًا
The Adhan of Bilal should not mislead you nor the whiteness (of the pillar) of dawn, for it is not the whiteness of the true dawn, but that of the false dawn which is vertical like a pillar and you can eat food till the streaks of whiteness spread like it. (Using translation from Muslim 1094b)
قَالَ رَسُولُ اللهِ ﷺ لَا يَغُرَّنَّكُمْ أَذَانُ بِلَالٍ وَلَا هَذَا الْبَيَاضُ لِعَمُودِ الصُّبْحِ حَتَّى يَسْتَطِيرَ