Who Are the Weak in Faith in Romans 14:1?

As for the one who is weak in faith, welcome him, but not to quarrel over opinions.
Romans 14:1 ESV

Are the "weak in faith" those people who believe trying to obey the Law or in keeping those commandments that are distinctively "Jewish"? Or are they people who are so afraid of breaking an actual commandment that they add all kinds of new rules just to be safe?

From Jay Carper at Common Sense Bible Study (https://CommonSenseBibleStudy.com) and American Torah (https://www.AmericanTorah.com).

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