Abu Amr al-Shaybani (may Allah have mercy on him) relates that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: The sa'ibah may spend his wealth wherever he wishes.
Shu'bah said: No one heard this from Salamah except me.
Al-Shaykh (may Allah have mercy on him) said: What is meant is that he may place it wherever he wishes during his lifetime, because his master would keep away from taking his wealth after his death.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الولاء / 21487