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Why did Muhammed choose Abyssinia for his converts?

«يَا عِبَادِيَ الَّذِينَ آمَنُوا إِنَّ أَرْضِي وَاسِعَةً فَإِيَّايَ فَاعْبُدُونِ »

[chapter al ankabut, 56]

he ordered them to migrate to Abyssinia saying that:

"there rules a tolerant king that wouldn't oppress anyone, besides it's a country of honesty."

[History of Tabari, vol. 2, p.70.]