It is narrated from Abu Jamrah (may Allah be pleased with him): I said to Sayyiduna Ibn Abbas (may Allah be pleased with them both): I recite the Qur'an hastily. Ibn Abbas (may Allah be pleased with them both) said: That I recite only Surah al-Baqarah in measured tones is far better to me than reciting the whole Qur'an hastily.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2430