The High Court of Justice passed the the 8-1 decision on Monday. This means that people undergoing Reform or Conservative conversions in Israel will be recognized as Jews under the Law of Return, meaning that they and their immediate families, including grandchildren, can make aliyah. Before the law was passed, only conversions into the faith via the Orthodox sect were recognized.
This ruling has caused controversy with many praising the decision and others condemning it.
Following the ruling, the ultra-Orthodox United Torah Judaism Party released a controversial campaign video showing pictures of dogs with kippot, comparing Reform Jews to dogs and saying that even dogs can be allowed to convert.
Lau wrote to Rabbinical conversion judges that they are judged by others with "some claiming you are to strict and some claiming you are too lenient." Lau said he was "sorry to hear that recently there have been unjustified comments on the activity of the conversion courts."
"I have had the privilege to work closely with you, and I understand the heavy and complicated Halachic questions that you deal with, questions that you take extremely seriously and work tirelessly over," said Lau.
"Do not heed to lies and false accusations that are being levied against you, ignore them. Your judgement is from above."
Lau reinforced the purpose, dedication and path of the judges in his encouragement."The purpose of a judge is not to see different sides [of a situation], it is to stick to the truth that the Torah has laid out before us," he said. "The truth must be like a candle before your feet."
Herb Keinon and Sarah Ben Nun contributed to this report.