The court issued the sentence in the first hearing in the case of Joanna Demafelis, the 29-year-old maid whose body was found in a freezer in Kuwait earlier this year.
The sentencing can still be appealed if the couple returns to Kuwait, the source told AFP on condition of anonymity.
PIA suspends flights to Kuwait and city of Salalah in Oman
The Demafelis murder triggered a diplomatic crisis between Kuwait and the Philippines, prompting Manila to impose a departure ban for its citizens planning to work in the Gulf state.
The Lebanese-Syrian couple was arrested in February in the Syrian capital Damascus following an Interpol manhunt.
Syrian authorities handed the husband, Nader Essam Assaf, over to Lebanese authorities, while his Syrian wife remained in custody in Damascus.
Philippines halts sending workers to Kuwait over deaths, abuses
An estimated 252,000 Filipinos and Filipinas work in Kuwait and depend on remittances to help their families back home.
Rights groups have raised alarm around the plight of workers in the Gulf and other Arab countries, where migrant labour is regulated under a system known as "kafala."
The kafala, or sponsorship, system ties migrant workers' visas to their employers, prohibiting workers from leaving or changing jobs without prior consent.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ