In a triangle $ABC$, the incircle touches the sides $BC, CA, AB$ at $D, E, F$ respectively. If the radius if the incircle is $4$ units and if $BD, CE , AF$ are consecutive integers, find the sides of the triangle $ABC$.
1. Let \( BD = x \), \( CE = x+1 \), and \( AF = x+2 \). By the properties of the incircle, we know that \( AE = AF \), \( CD = CE \), and \( BF = BD \). Therefore, the side lengths of the triangle can be expressed as:
   \[
   BC = BD + DC = x + (x+1) = 2x + 1
   \]
   \[
   CA = CE + EA = (x+1) + (x+2) = 2x + 3
   \]
   \[
   AB = AF + FB = (x+2) + x = 2x + 2
   \]

2. Let \( y = 2x + 2 \). Then the side lengths of the triangle are:
   \[
   AB = y, \quad AC = y + 1, \quad BC = y - 1
   \]
   Note that \( y \) must be even since \( 2x + 2 \) is always even.

3. Using Heron's formula to find the area of the triangle, we first calculate the semi-perimeter \( s \):
   \[
   s = \frac{AB + AC + BC}{2} = \frac{y + (y+1) + (y-1)}{2} = \frac{3y}{2}
   \]

4. The area \( A \) of the triangle using Heron's formula is:
   \[
   A = \sqrt{s(s-a)(s-b)(s-c)} = \sqrt{\left(\frac{3y}{2}\right) \left(\frac{3y}{2} - y\right) \left(\frac{3y}{2} - (y+1)\right) \left(\frac{3y}{2} - (y-1)\right)}
   \]
   Simplifying the terms inside the square root:
   \[
   A = \sqrt{\left(\frac{3y}{2}\right) \left(\frac{y}{2}\right) \left(\frac{y-2}{2}\right) \left(\frac{y+2}{2}\right)}
   \]
   \[
   A = \sqrt{\frac{3y \cdot y \cdot (y-2) \cdot (y+2)}{16}} = \frac{\sqrt{3y^2(y^2 - 4)}}{4}
   \]
   \[
   A = \frac{y \sqrt{3y^2 - 12}}{4}
   \]

5. The area \( A \) can also be expressed using the inradius \( r \) and the semi-perimeter \( s \):
   \[
   A = r \cdot s = 4 \cdot \frac{3y}{2} = 6y
   \]

6. Equating the two expressions for the area:
   \[
   \frac{y \sqrt{3y^2 - 12}}{4} = 6y
   \]
   Simplifying, we get:
   \[
   \sqrt{3y^2 - 12} = 24
   \]
   Squaring both sides:
   \[
   3y^2 - 12 = 576
   \]
   \[
   3y^2 = 588
   \]
   \[
   y^2 = 196
   \]
   \[
   y = 14
   \]

7. Therefore, the side lengths of the triangle are:
   \[
   y = 14, \quad y-1 = 13, \quad y+1 = 15
   \]

The final answer is \(\boxed{13, 14, 15}\).