Salim bin Abdullah (may Allah have mercy on him) said: Sayyiduna Umar (may Allah be pleased with him) and Abdullah bin Umar (may Allah be pleased with them both) used to forbid 'azl (withdrawal), whereas Sa'd bin Abi Waqqas (may Allah be pleased with him) and Zayd bin Thabit (may Allah be pleased with him) both used to practise 'azl.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14328